JAVA: Can't get context parameters in Filter
- by DaTval
Hello,
I have a filter and parameters in web.xml
web.xml is like this:
<filter>
<description>
</description>
<display-name>AllClassFilter</display-name>
<filter-name>AllClassFilter</filter-name>
<filter-class>com.datval.homework.AllClassFilter</filter-class>
<init-param>
<param-name>DB_URL</param-name>
<param-value>jdbc:derby:C:/Users/admin/workspace/homework03/homework/databases/StudentsDB;create=true</param-value>
</init-param>
<init-param>
<param-name>DB_DIALECT</param-name>
<param-value>org.hibernate.dialect.DerbyDialect</param-value>
</init-param>
<init-param>
<param-name>DB_DRIVER</param-name>
<param-value>org.apache.derby.jdbc.EmbeddedDriver</param-value>
</init-param>
</filter>
mapping is working well.
But I can't get this parameters in my filter.
public void init(FilterConfig config) throws ServletException {
// TODO Auto-generated method stub
debugMessage = config.getInitParameter("debugMessage");
ctx = config.getServletContext();
}
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
// TODO Auto-generated method stub
// place your code here
ctx.log("Start - " + debugMessage);
String myDbUrl = ctx.getInitParameter("DB_URL");
String DB_DIALECT = ctx.getInitParameter("DB_DIALECT");
String DB_DRIVER = ctx.getInitParameter("DB_DRIVER");
Map<String,String> pr = new HashMap<String,String>();
pr.put("hibernate.connection.url", myDbUrl);
pr.put("hibernate.dialect", DB_DIALECT);
pr.put("hibernate.connection.driver_class", DB_DRIVER);
EntityManagerFactory emf = Persistence.createEntityManagerFactory("students",pr);
EntityManager em = emf.createEntityManager();
request.setAttribute("em", em);
chain.doFilter(request, response);
em.close();
ctx.log("end - " + debugMessage);
}
I have checked and myDbUrl is null. What I'm doing wrong? Any idea?
Sorry about code, I will change it later :)
