Problem: If I make any change to my application's web.xml (even as
small as a single space), I can't access any of Tomcat's
pages/servlets.
Info to narrow things down (hopefully):
- I think Tomcat reloads things whenever a change is made to web.xml.
But I haven't been able to find some good information on this yet.
- The application is located under CATALINA_HOME\webapps. I tried
creating a context file under conf/catalina/localhost and set
reloadable="false", but it didn't help.
- Since this problem isn't seen if I edit the web.xml of any of
Tomcat's example applications, it might have something to do with how
my application initializes. But nothing shows up in the logs anywhere,
other than the stack trace I get when I try to access any page. Would
anyone know which tomcat elements I should enable the debugging info
for, to get more info about the re-initialization.
- This is the stack trace I get if I try to access anything, after the
web.xml editing:
exception
javax.servlet.ServletException: Error allocating a servlet instance
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664)
org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:135)
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:706)
java.lang.Thread.run(Thread.java:595)
root cause
java.lang.NullPointerException
org.eclipse.osgi.framework.internal.core.FrameworkProperties.getProperty(FrameworkProperties.java:58)
org.eclipse.osgi.framework.internal.core.FrameworkProperties.getProperty(FrameworkProperties.java:51)
org.eclipse.osgi.framework.util.SecureAction.getProperty(SecureAction.java:49)
org.eclipse.osgi.framework.internal.protocol.StreamHandlerFactory.createURLStreamHandler(StreamHandlerFactory.java:85)
java.net.URL.getURLStreamHandler(URL.java:1104)
java.net.URL.<init>(URL.java:393)
java.net.URL.<init>(URL.java:283)
java.net.URL.<init>(URL.java:306)
java.io.File.toURL(File.java:594)
org.apache.catalina.loader.WebappClassLoader.getURL(WebappClassLoader.java:2292)
org.apache.catalina.loader.WebappClassLoader.findResourceInternal(WebappClassLoader.java:1966)
org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:1749)
org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:866)
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1319)
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1198)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664)
org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:135)
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:706)
java.lang.Thread.run(Thread.java:595)
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