Cannot deploy using .war file

Question

im using ant to build my war file.
the application works when i copy the build/web to %catalina%\webapps folder but when i use war file there is error.
i check the directory and the files of the working and not working source files but nothing seems to be different.
can anyone help?
java.lang.NullPointerException
     at com.saw.Media.UserAccessBean.closeConnection(UserAccessBean.java:262)
     at com.saw.Media.UserAccessBean.addUser(UserAccessBean.java:177)
     at org.apache.jsp.addUser1_jsp._jspService(addUser1_jsp.java:176)
     at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:137)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
     at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:210)
     at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:295)
     at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
     at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:684)
     at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:432)
     at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:356)
     at com.saw.Media.SVLDispatcherServlet.doPost(SVLDispatcherServlet.java:143)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247)
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)
     at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:256)
     at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
     at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
     at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
     at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2417)
     at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180)
     at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
     at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:171)
     at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
     at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:172)
     at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
     at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:174)
     at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
     at org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:193)
     at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:781)
     at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:549)
     at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:589)
     at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:666)
     at java.lang.Thread.run(Thread.java:534)

Answer 1

Thanks for replying.
i used the example at this web site http://jakarta.apache.org/tomcat/tomcat-4.1-doc/jndi-datasource-examples-howto.html
everything worked.
jakarta-tomcat-4.1.29
jakarta-ant-1.5-bin
mysql-4.0.16-win
mysql-connector-java-3.0.9-stable
I suspect its my .java code. I tried to change the .java code but more errors which i dont understand comes up.
public void addUser() throws Exception
Connection dbConnection = null;
try {
dbConnection = getConnection();
add(dbConnection);
} catch (SQLException e) {
System.out.println(e.getMessage());
// Print any other nested exceptions
while ((e = e.getNextException()) != null) {
System.out.println(" next " + e.getMessage());
throw e; // Re-throw the SQLException
} finally {
closeConnection(dbConnection);
} // addUser()
// PRIVATE METHODS
// ===============
// Add an user to the database
private void add(Connection conn) throws Exception
PreparedStatement ps = null;
// Build the SQL statement
StringBuffer sql = new StringBuffer();
sql.append("INSERT INTO USERS ");
sql.append("(user_name, user_pass, user_full_name) " ); // Leave a space at the end
sql.append("VALUES (?, ?, ?) ");
// Execute SQL statement
try {
ps = conn.prepareStatement(sql.toString());
ps.setString(1, userName); // Set the missing values in the prepared statement
ps.setString(2, userPass);
ps.setString(3, userFullName);
count = ps.executeUpdate();
} catch (SQLException e) {
count = 0; // So we know the operation was not successful
// Here we are catching exceptions to reset a counter and optionally
// for debugging purposes
// May be we could log them to a file
// Once caught, we are re-throwing them once again to a higher level
// So, we need the catch block even if we are not debugging
System.out.println(e.getMessage());
// Print any other nested exceptions
while ((e = e.getNextException()) != null) {
System.out.println(" next " + e.getMessage());
throw e; // Re-throw the SQLException
// will be caught at a higher level
} finally {
ps.close();
} // add()
* Gets a datasource connection
* Different from getting a databse connection using DriverManager
* @param jndiName Name of datasource
Connection getConnection()
throws NamingException, SQLException {
Context initCtx = null;
try {
// Obtain the initial JNDI context
initCtx = new InitialContext();
// Perform JNDI lookup to obtain resource manager connection factory
DataSource ds =
(javax.sql.DataSource)
initCtx.lookup("java:comp/env/jdbc/" + jndiName);
// Invoke factory to obtain a connection
return ds.getConnection();
} finally {
// Don't forget to close the naming context
if (initCtx != null) {
initCtx.close();
} // getConnection()
// Close a datasource connection
// Similar to closing a database connection
private void closeConnection (Connection conn) throws Exception {
conn.close();
} // closeConnection()