I tried to use Ant to compile the jsoup source. I can compile successfully, but cannot pass the test. Here is the process:

jsoup version: 1.6.3 ; Ant version: 1.8.2

the source of jsoup is in the directory

src/

I made a build file

src/build.xml

This file contains

<project name="jsoup">
<target name="compile">
    <mkdir dir="build/classes"/>
    <javac srcdir="src" destdir="build/classes" includeantruntime="false"/>
</target>

<target name="jar">
    <mkdir dir="build/jar"/>
    <jar destfile="build/jar/jsoup.jar" basedir="build/classes">
        <manifest>
            <attribute name="Main-Class" value="StateTrace"/>
        </manifest>
    </jar>
</target>

<target name="run">
    <!--<java jar="build/jar/jsoup.jar" input="htmls/index.html" fork="true"/>-->
    <exec executable="java">
        <arg value="-jar"/>
        <arg value="build/jar/jsoup.jar"/>
        <arg value="htmls/index.html"/>
    </exec>
</target>
</project>

Note: 1. StateTrace.java is my own test program; 2. htmls/index.html is the input to StateTrace.java.

Then I compile and run it with Ant:

> ant compile
> ant jar
> ant run

After this, I got err like:

run:
 [exec] Exception in thread "main" java.lang.ExceptionInInitializerError
 [exec]     at org.jsoup.nodes.Entities$EscapeMode.<clinit>(Unknown Source)
 [exec]     at org.jsoup.nodes.Document$OutputSettings.<init>(Unknown Source)
 [exec]     at org.jsoup.nodes.Document.<init>(Unknown Source)
 [exec]     at org.jsoup.parser.TreeBuilder.initialiseParse(Unknown Source)
 [exec]     at org.jsoup.parser.TreeBuilder.parse(Unknown Source)
 [exec]     at org.jsoup.parser.HtmlTreeBuilder.parse(Unknown Source)
 [exec]     at org.jsoup.parser.Parser.parse(Unknown Source)
 [exec]     at org.jsoup.Jsoup.parse(Unknown Source)
 [exec]     at StateTrace.main(Unknown Source)
 [exec] Caused by: java.lang.NullPointerException
 [exec]     at java.util.Properties$LineReader.readLine(Properties.java:418)
 [exec]     at java.util.Properties.load0(Properties.java:337)
 [exec]     at java.util.Properties.load(Properties.java:325)
 [exec]     at org.jsoup.nodes.Entities.loadEntities(Unknown Source)
 [exec]     at org.jsoup.nodes.Entities.<clinit>(Unknown Source)
 [exec]     ... 9 more
 [exec] Result: 1

BUILD SUCCESSFUL
Total time: 0 seconds

However, if I manually compiled all the java source, like

javac src/org/jsoup/*.java src/org/jsoup/parser/*.java src/org/jsoup/examples/*.java src/org/jsoup/nodes/*.java src/org/jsoup/safety/*.java src/org/jsoup/select/*.java src/org/jsoup/helper/*.java

I could compile successfully and pass my test.

Any clue? Thanks!