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• Running Hadoop example in psuedo-distributed mode on vm

  - by manas

  I have set-up Hadoop on a OpenSuse 11.2 VM using Virtualbox.I have made the prerequisite configs. I ran this example in the Standalone mode successfully. But in psuedo-distributed mode I get the following error: $./bin/hadoop fs -put conf input 10/04/13 15:56:25 INFO hdfs.DFSClient: Exception in createBlockOutputStream java.net.SocketException: Protocol not available 10/04/13 15:56:25 INFO hdfs.DFSClient: Abandoning block blk_-8490915989783733314_1003 10/04/13 15:56:31 INFO hdfs.DFSClient: Exception in createBlockOutputStream java.net.SocketException: Protocol not available 10/04/13 15:56:31 INFO hdfs.DFSClient: Abandoning block blk_-1740343312313498323_1003 10/04/13 15:56:37 INFO hdfs.DFSClient: Exception in createBlockOutputStream java.net.SocketException: Protocol not available 10/04/13 15:56:37 INFO hdfs.DFSClient: Abandoning block blk_-3566235190507929459_1003 10/04/13 15:56:43 INFO hdfs.DFSClient: Exception in createBlockOutputStream java.net.SocketException: Protocol not available 10/04/13 15:56:43 INFO hdfs.DFSClient: Abandoning block blk_-1746222418910980888_1003 10/04/13 15:56:49 WARN hdfs.DFSClient: DataStreamer Exception: java.io.IOException: Unable to create new block. at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.nextBlockOutputStream(DFSClient.java:2845) at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.access$2000(DFSClient.java:2102) at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream$DataStreamer.run(DFSClient.java:2288) 10/04/13 15:56:49 WARN hdfs.DFSClient: Error Recovery for block blk_-1746222418910980888_1003 bad datanode[0] nodes == null 10/04/13 15:56:49 WARN hdfs.DFSClient: Could not get block locations. Source file "/user/max/input/core-site.xml" - Aborting... put: Protocol not available 10/04/13 15:56:49 ERROR hdfs.DFSClient: Exception closing file /user/max/input/core-site.xml : java.net.SocketException: Protocol not available java.net.SocketException: Protocol not available at sun.nio.ch.Net.getIntOption0(Native Method) at sun.nio.ch.Net.getIntOption(Net.java:178) at sun.nio.ch.SocketChannelImpl$1.getInt(SocketChannelImpl.java:419) at sun.nio.ch.SocketOptsImpl.getInt(SocketOptsImpl.java:60) at sun.nio.ch.SocketOptsImpl.sendBufferSize(SocketOptsImpl.java:156) at sun.nio.ch.SocketOptsImpl$IP$TCP.sendBufferSize(SocketOptsImpl.java:286) at sun.nio.ch.OptionAdaptor.getSendBufferSize(OptionAdaptor.java:129) at sun.nio.ch.SocketAdaptor.getSendBufferSize(SocketAdaptor.java:328) at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.createBlockOutputStream(DFSClient.java:2873) at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.nextBlockOutputStream(DFSClient.java:2826) at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.access$2000(DFSClient.java:2102) at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream$DataStreamer.run(DFSClient.java:2288) Any leads will be highly appreciated.

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• Outlook MAPI session exception when outlook interface is closed

  - by michele

  I'm developing a email sender that retrieve data from a database, build up a MailItem with the Outlook Interop and send it. My email sender is running by a windows service that is notified everytime there's some data to send. I'm logging on the MAPI session of Outlook without problem and everything seems to work. But... when someone open Outlook interface and then close, my service crash at the first attempt i call a SendAndReceive method, with an exception that report that the session is assigned to another thread. I'm googling around for hours and i'm listening to the application_quit event, raised by the interface closing, trying to logoff and logon again to the application...but i'm still falling in the same error. Where am i wrong?Any suggestion? Thank you in advance

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• Saving Interface Builder Changes when building in Xcode

  - by Tony Eichelberger

  I know many of you have experienced the same the scenario, where you are banging your head against the wall wondering what is wrong with your app only to find that you have forgotten to save your Interface Builder changes. Well, this never happens to me, because for some reason Xcode will prompt me to save any changes in Interface Builder whenever I build. A coworker and I are trying to figure out how to change this on his machine, with no success. I must have done something in the very early stages of my iphone development life to configure this. Does anyone know how to link IB with Xcode so that it will prompt to save changes to IB files during a build?

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• How to add group using RESTFUL interface in Crowd

  - by joe

  How to add group in Crowd using RESTFUL interface?

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• JPA @TableGenerator shared between multiple entities

  - by Mauricio

  Hi Guys, I have a 'dog' Entitiy with an @Id and a @TableGenerator ... @TableGenerator(table = "seq", name = "dog_gen", pkColumnName = "seq_name", valueColumnName="seq_val") @Id @GeneratedValue(strategy = GenerationType.TABLE, generator = "dog_gen") private Long id; ... Is there a way to reuse the same table generator (dog_gen) in other entity? I want to keep the same id sequence in two independent Entities, say dog=1, dog=2, dog=3, cat=4, cat=5, dog=6 and so on... Both entities don't share a common superclass to implement some kind of inheritance with the id property. If I add the @GeneratedValue( generator="dog_gen") on my cat entity, omitting the @TableGenerator declaration throws an Exception saying it can't find the generator when starting the context. Caused by: org.hibernate.AnnotationException: Unknown Id.generator: dog_gen at org.hibernate.cfg.BinderHelper.makeIdGenerator(BinderHelper.java:413) at org.hibernate.cfg.AnnotationBinder.bindId(AnnotationBinder.java:1795) at org.hibernate.cfg.AnnotationBinder.processElementAnnotations(AnnotationBinder.java:1229) at org.hibernate.cfg.AnnotationBinder.bindClass(AnnotationBinder.java:733) at org.hibernate.cfg.AnnotationConfiguration.processArtifactsOfType(AnnotationConfiguration.java:498) at org.hibernate.cfg.AnnotationConfiguration.secondPassCompile(AnnotationConfiguration.java:277)

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• CPU and profiling not supported for remote jvisualvm session

  - by yawn

  When monitoring a remote app (using jstatd) I can neither profile nor monitor cpu consumption. Heap monitoring (provided I do not use G1) works. jvisualvm provides the message "Not supported for this JVM." in the CPU graph window. Is there anything missing in my setup? The google showed up next to no results. The local environment (Mac OS X 10.6): java version "1.6.0_15" Java(TM) SE Runtime Environment (build 1.6.0_15-b03-219) Java HotSpot(TM) 64-Bit Server VM (build 14.1-b02-90, mixed mode) The remote environment (Linux version 2.6.16.27-0.9-smp (gcc version 4.1.0 (SUSE Linux))): java version "1.6.0_16" Java(TM) SE Runtime Environment (build 1.6.0_16-b01) Java HotSpot(TM) 64-Bit Server VM (build 14.2-b01, mixed mode) Local monitoring works as advertised.

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• crawl websites out of java web application without using bin/nutch

  - by Marcel

  hi :) i am trying to using nutch (1.1) without bin/nutch from my (java) mojarra 2.0.2 webapp... i am searching at google for examples, but there are no examples how i can realize this :/ ... i get an exception and the job fails :/ (i think of cause something with hadoop)... here is my code: public void run() throws Exception { final String[] args = new String[] { String.format("%s%s%s%s", JSFUtils.getWebAppRoot(), "nutch", File.separator, DIRECTORY_URLS), "-dir", String.format("%s%s%s%s", JSFUtils.getWebAppRoot(), "nutch", File.separator, DIRECTORY_CRAWL), "-threads", this.preferences.get("threads"), "-depth", this.preferences.get("depth"), "-topN", this.preferences.get("topN"), "-solr", this.preferences.get("solr") }; Crawl.main(args); } and a part of the logging: 10/05/17 10:42:54 INFO jvm.JvmMetrics: Initializing JVM Metrics with processName=JobTracker, sessionId= 10/05/17 10:42:54 WARN mapred.JobClient: Use GenericOptionsParser for parsing the arguments. Applications should implement Tool for the same. 10/05/17 10:42:54 INFO mapred.FileInputFormat: Total input paths to process : 1 10/05/17 10:42:54 INFO mapred.JobClient: Running job: job_local_0001 10/05/17 10:42:54 INFO mapred.FileInputFormat: Total input paths to process : 1 10/05/17 10:42:55 INFO mapred.MapTask: numReduceTasks: 1 10/05/17 10:42:55 INFO mapred.MapTask: io.sort.mb = 100 java.io.IOException: Job failed! at org.apache.hadoop.mapred.JobClient.runJob(JobClient.java:1232) at org.apache.nutch.crawl.Injector.inject(Injector.java:211) at org.apache.nutch.crawl.Crawl.main(Crawl.java:124) at lan.localhost.process.NutchCrawling.run(NutchCrawling.java:108) at lan.localhost.main.Index.indexing(Index.java:71) at lan.localhost.bean.FeedingBean.actionStart(FeedingBean.java:25) .... can someone help me or tell me how i can crawling from a java application? i have increased the Xms to 256m and Xmx to 768m, but nothing changed... best regards marcel

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• Adding info to an exception

  - by NoozNooz42

  I'd like to add information to a stack trace/exception. Basically I've got something like this as of now, which I really like: Exception in thread "main" java.lang.ArithmeticException: / by zero at com.so.main(SO.java:41) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke However I'd like to catch that exception and add additional info to it, while still having the original stack trace. For example, I'd like to have that: Exception in thread "main" CustomException: / by zero (you tried to divide 42 by 0) at com.so.main(SO.java:41) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke So basically I want to catch the ArithmeticException and rethrow, say, a CustomException (adding "you tried to divide 42 by 0" in this example) while still keeping the stacktrace from the original ArithmeticException. What is the correct way to do this in Java? Is the following correct: try { .... } catch (ArithmeticException e) { throw new CustomException( "You tried to divide " + x + " by " + y, e ); }

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• android: tesseract force close

  - by Vishnu Mohan G

  I tried the tesseract tutorial here and get the following error: 06-03 01:18:52.626: E/AndroidRuntime(15103): FATAL EXCEPTION: main 06-03 01:18:52.626: E/AndroidRuntime(15103): java.lang.ExceptionInInitializerError 06-03 01:18:52.626: E/AndroidRuntime(15103): at o.c.r.LetsTryOCrActivity.onCreate(LetsTryOCrActivity.java:28) 06-03 01:18:52.626: E/AndroidRuntime(15103): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 06-03 01:18:52.626: E/AndroidRuntime(15103): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1722) 06-03 01:18:52.626: E/AndroidRuntime(15103): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1784) 06-03 01:18:52.626: E/AndroidRuntime(15103): at android.app.ActivityThread.access$1500(ActivityThread.java:123) 06-03 01:18:52.626: E/AndroidRuntime(15103): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:939) 06-03 01:18:52.626: E/AndroidRuntime(15103): at android.os.Handler.dispatchMessage(Handler.java:99) 06-03 01:18:52.626: E/AndroidRuntime(15103): at android.os.Looper.loop(Looper.java:130) 06-03 01:18:52.626: E/AndroidRuntime(15103): at android.app.ActivityThread.main(ActivityThread.java:3835) 06-03 01:18:52.626: E/AndroidRuntime(15103): at java.lang.reflect.Method.invokeNative(Native Method) 06-03 01:18:52.626: E/AndroidRuntime(15103): at java.lang.reflect.Method.invoke(Method.java:507) 06-03 01:18:52.626: E/AndroidRuntime(15103): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:847) 06-03 01:18:52.626: E/AndroidRuntime(15103): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:605) 06-03 01:18:52.626: E/AndroidRuntime(15103): at dalvik.system.NativeStart.main(Native Method) 06-03 01:18:52.626: E/AndroidRuntime(15103): Caused by: java.lang.UnsatisfiedLinkError: Couldn't load lept: findLibrary returned null 06-03 01:18:52.626: E/AndroidRuntime(15103): at java.lang.Runtime.loadLibrary(Runtime.java:429) 06-03 01:18:52.626: E/AndroidRuntime(15103): at java.lang.System.loadLibrary(System.java:554) 06-03 01:18:52.626: E/AndroidRuntime(15103): at com.googlecode.tesseract.android.TessBaseAPI.(TessBaseAPI.java:42) 06-03 01:18:52.626: E/AndroidRuntime(15103): ... 14 more Please help me solve this. thanks in Advance!.

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• Does form with enctype="multipart/form-data" cause problems accessing a hidden field

  - by Ankur

  I have created a hidden form element <form name="UploadImage" enctype="multipart/form-data" method="post" action="UploadImage"> <label> </label> <input name="imgUploadObjId" id="imgUploadObjId" value="52" type="hidden"> //rest of the form here </form> And I am trying to get the value with this line in a servlet (as I have done before): int objId = Integer.parseInt(request.getParameter("imgUploadObjId")); But I get this (line 33 is the line above): java.lang.NumberFormatException: null java.lang.Integer.parseInt(Unknown Source) java.lang.Integer.parseInt(Unknown Source) web.objects.UploadImage.doPost(UploadImage.java:33) javax.servlet.http.HttpServlet.service(HttpServlet.java:637) javax.servlet.http.HttpServlet.service(HttpServlet.java:717) Is there something different about a form with enctype="multipart/form-data"? Or can you see some other error.

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• EntityManagerFactory error on Websphere

  - by neverland

  I have a very weird problem. Have an application using Hibernate and spring.I have an entitymanger defined which uses a JNDI lookup .It looks something like this <bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean"> <property name="dataSource" ref="dataSource" /> <property name="persistenceUnitName" value="ConfigAPPPersist" /> <property name="jpaVendorAdapter"> <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter"> <property name="showSql" value="true" /> <property name="generateDdl" value="false" /> <property name="databasePlatform" value="org.hibernate.dialect.Oracle9Dialect" /> </bean> </property> </bean> <bean id="dataSource" class="org.springframework.jdbc.datasource.WebSphereDataSourceAdapter"> <property name="targetDataSource"> <bean class="org.springframework.jndi.JndiObjectFactoryBean"> <property name="jndiName" value="jdbc/pmp" /> </bean> </property> </bean> This application runs fine in DEV. But when we move to higher envs the team that deploys this application does it successfully initially but after a few restarts of the application the entitymanager starts giving this problem Caused by: javax.persistence.PersistenceException: [PersistenceUnit: ConfigAPPPersist] Unable to build EntityManagerFactory at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:677) at org.hibernate.ejb.HibernatePersistence.createContainerEntityManagerFactory(HibernatePersistence.java:132) at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.createNativeEntityManagerFactory(LocalContainerEntityManagerFactoryBean.java:224) at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.afterPropertiesSet(AbstractEntityManagerFactoryBean.java:291) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1368) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1334) ... 32 more Caused by: org.hibernate.MappingException: **property mapping has wrong number of columns**: com.***.***.jpa.marketing.entity.MarketBrands.$performasure_j2eeInfo type: object Now you would say this is pretty obvious the entity MarketBrands is incorrect. But its not it maps to the table just fine. And the same code works on DEV. Also the jndi cannot be incorrect since it deploys and works fine initially but throws uo this error after a restart. This is weird and not very logical. But if someone has faced this or has any idea on what might be causing this Please!! help The persistence.xml for the persitence unit has very little <?xml version="1.0" encoding="UTF-8"?> <persistence xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd" version="1.0"> <persistence-unit name="ConfigAPPPersist"> <!-- commented code --> </persistence-unit> </persistence>

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• How to list TODO: in Ant build output

  - by C. Ross

  Related: How to use ant to check for tags (TODO: etc) in java source How can I get ant to list TODO: tags found in my code in the build output when I run it. I would like build failure to be optional (ie: a setting) if they are found. I've tried Checkstyle as suggested in the related post, but it doesn't display the text of the TODO:. IE: [checkstyle] .../src/Game.java:36: warning: Comment matches to-do format 'TODO:'. [checkstyle] .../src/Game.java:41: warning: Comment matches to-do format 'TODO:'. [checkstyle] .../src/GameThread.java:25: warning: Comment matches to-do format 'TODO:'. [checkstyle] .../src/GameThread.java:30: warning: Comment matches to-do format 'TODO:'. [checkstyle] .../src/GameThread.java:44: warning: Comment matches to-do format 'TODO:'.

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• Ant + JUnit = ClassNotFoundExceptions when running tests?

  - by rfkrocktk

  I'm trying to run some tests in Ant presently using JUnit, and all of my tests are failing with the following stacktrace: java.lang.ClassNotFoundException: com.mypackage.MyTestCase It doesn't make too much sense to me. I'm first compiling my test cases using <javac>, then directly running the <junit> task to run the tests. My buildfile looks like this: <target name="compile.webapp.tests"> <javac srcdir="${test.java.src.dir}" destdir="${test.java.bin.dir}"> <classpath> <filelist> <file name="${red5.home}/red5.jar"/> <file name="${red5.home}/boot.jar"/> <file name="${bin.dir}/${ant.project.name}.jar"/> </filelist> <fileset dir="${red5.lib.dir}" includes="**/*"/> <fileset dir="${main.java.lib.dir}" includes="**/*"/> <fileset dir="${test.java.lib.dir}" includes="**/*"/> </classpath> </javac> </target> <target name="run.webapp.tests"> <junit printsummary="true"> <classpath> <filelist> <file name="${red5.home}/red5.jar"/> <file name="${red5.home}/boot.jar"/> <file name="${bin.dir}/${ant.project.name}.jar"/> </filelist> <fileset dir="${red5.lib.dir}" includes="**/*.jar"/> <fileset dir="${main.java.lib.dir}" includes="**/*.jar"/> <fileset dir="${test.java.lib.dir}" includes="**/*.jar"/> </classpath> <formatter type="xml"/> <batchtest todir="${test.java.output.dir}"> <fileset dir="${test.java.bin.dir}" includes="**/*TestCase*"/> </batchtest> </junit> </target> This is really weird, I can't seem to fix this. Is there something I'm doing wrong here?

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• slsvcutil.exe Proxy and Interfaces

  - by JPM

  Is it possible when using slsvcutil.exe to generate a proxy through the command line not to have the proxy file output the Interface in an Asynchronous fashion. For example, if I have a function "foo()" on the serverside in the Interface, when I generate the proxy using Slsvcutil.exe, it makes two functions in the interface definition in the proxy named "BeginFoo()" and "EndFoo()". All I want is "Foo()", I don't need the other two methods. Is this possible? I'm using the proxy with Monotouch which is why I need to use Slsvcutil.exe but don't need the Asynchronous methods. Thanks!

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• Autotesting a network interface

  - by Machado

  Hi All, I'm developing a software component responsible for testing if a network interface has conectivity with the internet. Think of it as the same test the XBOX360 does to inform the user if it's connected with the Live network (just as an example). So far I figured the autotest would run as this: 1) Test the physical network interface (if the cable is conected, has up/downlink, etc...) 2) Test the logical network (has IP address, has DNS, etc...) 3) Connects to the internet (can access google, for example) 4) ??? 5) Profit! (just kidding...) My question relates to step 3: How can I detect, correctly, if my software has connection with the internet ? Is there any fixed IP address to ping ? The problem is that I don't want to rely solely on google.com (or any other well-known address), as those can change in time, and my component will be embbeded on a mobile device, not easy to update. Any suggestions ?

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• JDBC CallableStatement and Oracle SYS_REFCURSOR IN parameters?

  - by deebo

  Pretty much what it says in the title, how the hell is this supposed to be done? Basically i need to pass a null (empty?) ref cursor as an IN parameter to a stored procedure. /** spring's PreparedStatementSetter#setValues(...) */ public void setValues(PreparedStatement ps) throws SQLException { CallableStatement cs = (CallableStatement) ps; cs.setString(1,"constant"); //this is the IN param cs.setNull(2, OracleTypes.CURSOR); //this is the OUT param cs.registerOutParameter(3, OracleTypes.CURSOR); } And this fails with: caused by: java.sql.SQLException: Unsupported feature: sqlType=-10 at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:112) at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:146) at oracle.jdbc.driver.OraclePreparedStatement.setNullCritical(OraclePreparedStatement.java:4399) at oracle.jdbc.driver.OraclePreparedStatement.setNullInternal(OraclePreparedStatement.java:4161) at oracle.jdbc.driver.OracleCallableStatement.setNull(OracleCallableStatement.java:4472) I'm at a loss here, tried several different ways to do this, but I couldn't find any examples about this and have no idea how to do it properly.

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• The CHOICE : Firebird or H2

  - by blow

  Hi, i have to choice a database to use in server-mode for a java desktop application. I think both are great java database. In my opinion (im NOT well-informed): H2 PRO Is java based Develeopment say it is very very fast Easy to install, configure and use with java application H2 CONS Is a young project Reliability doubt for commercial porpouse FireBird PRO Rock solid project Well documented Should be fast and well optimized for large data Has a java driver... FireBird CONS It is not java based ... ? So, i can't choice between this great db, can i have a suggestion? Thank.

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• eclipse helios tomcat error

  - by itsraja

  Hi, I just created a struts application in eclipse Helios. when I run as server I get an alert like this. My browser is online only. This document cannot be displayed while offline. To go online, uncheck Work Offline from the File menu. and this is error displayed. Dec 23, 2010 7:20:37 PM org.apache.catalina.core.AprLifecycleListener init SEVERE: An incompatible version 1.1.15 of the APR based Apache Tomcat Native library is installed, while Tomcat requires version 1.1.17 Dec 23, 2010 7:20:37 PM org.apache.tomcat.util.digester.SetPropertiesRule begin WARNING: [SetPropertiesRule]{Server/Service/Engine/Host/Context} Setting property 'source' to 'org.eclipse.jst.jee.server:StrutsHelloWorld' did not find a matching property. Dec 23, 2010 7:20:37 PM org.apache.coyote.http11.Http11Protocol init INFO: Initializing Coyote HTTP/1.1 on http-8080 Dec 23, 2010 7:20:37 PM org.apache.catalina.startup.Catalina load INFO: Initialization processed in 1081 ms Dec 23, 2010 7:20:37 PM org.apache.catalina.core.StandardService start INFO: Starting service Catalina Dec 23, 2010 7:20:37 PM org.apache.catalina.core.StandardEngine start INFO: Starting Servlet Engine: Apache Tomcat/6.0.29 Dec 23, 2010 7:20:38 PM org.apache.catalina.core.StandardContext filterStart SEVERE: Exception starting filter struts2 java.lang.ClassNotFoundException: org.apache.struts2.dispatcher.FileDispatcher at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1645) at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1491) at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:269) at org.apache.catalina.core.ApplicationFilterConfig.setFilterDef(ApplicationFilterConfig.java:422) at org.apache.catalina.core.ApplicationFilterConfig.(ApplicationFilterConfig.java:115) at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:4001) at org.apache.catalina.core.StandardContext.start(StandardContext.java:4651) at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045) at org.apache.catalina.core.StandardHost.start(StandardHost.java:785) at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045) at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:445) at org.apache.catalina.core.StandardService.start(StandardService.java:519) at org.apache.catalina.core.StandardServer.start(StandardServer.java:710) at org.apache.catalina.startup.Catalina.start(Catalina.java:581) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289) at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414) Dec 23, 2010 7:20:38 PM org.apache.catalina.core.StandardContext start SEVERE: Error filterStart Dec 23, 2010 7:20:38 PM org.apache.catalina.core.StandardContext start SEVERE: Context [/StrutsHelloWorld] startup failed due to previous errors Thanks.

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• Asynchronous Processing in JBoss 6 ("Comet")

  - by chris_l

  edit: Retagged as tomcat, since this is really a question about the Tomcat embedded inside JBoss 6, rather than JBoss itself I have an extremely simple servlet, which works on Glassfish v3. It uses Servlet 3.0 Asynchronous Processing. Here's a simplified version (which doesn't do much): @WebServlet(asyncSupported=true) public class SimpleServlet extends HttpServlet { @Override protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { final AsyncContext ac = request.startAsync(); ac.setTimeout(3000); } } On JBoss 6.0.0 (Milestone 2), I get the following Exception: java.lang.IllegalStateException: The servlet or filters that are being used by this request do not support async operation at org.apache.catalina.connector.Request.startAsync(Request.java:3096) at org.apache.catalina.connector.Request.startAsync(Request.java:3090) at org.apache.catalina.connector.RequestFacade.startAsync(RequestFacade.java:990) at playcomet.SimpleServlet.doGet(SimpleServlet.java:18) at javax.servlet.http.HttpServlet.service(HttpServlet.java:734) ... Do I have to do anything special to enable Asynchronous Processing in JBoss 6? Or do I need an additional deployment descriptor? ...

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• Unexpected generics behaviour

  - by pronicles

  I found strange generics behaviour. In two words - thing I realy want is to use ComplexObject1 in most general way, and the thing I realy missed is why defined generic type(... extends BuisnessObject) is lost. The discuss thread is also awailable in my blog http://pronicles.blogspot.com/2010/03/unexpected-generics-behaviour.html. public class Test { public interface EntityObject {} public interface SomeInterface {} public class BasicEntity implements EntityObject {} public interface BuisnessObject<E extends EntityObject> { E getEntity(); } public interface ComplexObject1<V extends SomeInterface> extends BusinessObject<BasicEntity> {} public interface ComplexObject2 extends BuisnessObject<BasicEntity> {} public void test(){ ComplexObject1 complexObject1 = null; ComplexObject2 complexObject2 = null; EntityObject entityObject1 = complexObject1.getEntity(); //BasicEntity entityObject1 = complexObject1.getEntity(); wtf incompatible types!!!! BasicEntity basicEntity = complexObject2.getEntity(); } }

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• How to pass interface type/GUID reference to an automation method in Delphi

  - by Alan Clark

  In Delphi you can pass class references around to compare the types of objects, and to instantiate them. Can you do the same with interface references being passed to a COM automation server? For example, you can define a method taking a GUID parameter using the type library editor: function ChildNodesOfType(NodeType: TGUID): IMBNode; safecall; In this function I would like to return automation types that support the interface specified by NodeType, e.g. if Supports(SomeNode, NodeType) then result := SomeNode; But the Supports call always fails, I tried passing in the Guids defined in the type library but none of the different types (Ixxx, Class_xxxx, IId_Ixxxx) seem to work.

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• State pattern: Why doesn't the context class implement or inherit the State abstract interface/class

  - by Ricket

  I'm reading about the State pattern. I have only just begun, so of course I begin by reading the entire Wikipedia article on it. I noticed that both of the examples in the article have some base abstract class or Java interface for a generic State's methods/functions. Then there are some states which inherit from the base and implement those methods/functions in different ways. Then there's a Context class which has a private member of type State and which, at any time, can be equal to an instance of one of the implementations. That context class also implements the same methods, and passes them onto the current state instance, and then has an additional method to change the state (or depending on design I understand the change of state could be a reaction to one of the implemented methods). Why doesn't this context class specifically "extend" or "implement" the generic State base class/interface?

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• why we use Abstract class instead of interface?

  - by Azhar

  why we use Abstract class instead of interface? is it only to restrict object creation if not then any specific scenario

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• Interface Builder

  - by d.andreykiv

  What is the difference between creating an IPhone application using Interface Builder and without it?

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• Interface with symbol ppt88xx's bar code scanner using .NET CF

  - by NitroxDM

  I need to interface with a symbol ppt88xx's bar code scanner using .NET CF. Any ideas?

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