I'm using the Debian packaged version of Tomcat 4.1.31 and
running into some issues with JSP precompilation. I've created
tasks in my ant build file for the webapp I want to precompile:
<taskdef classname="org.apache.jasper.JspC" name="jasper2" >
<classpath id="jspc.classpath">
<pathelement location="/usr/local/jdk/lib/tools.jar"/>
<fileset dir="/usr/share/tomcat4/server/lib">
<include name="*.jar"/>
</fileset>
<fileset dir="/usr/share/tomcat4/common/lib">
<include name="*.jar"/>
</fileset>
</classpath>
</taskdef>
When I call that task, I get:
[echo] JSPC compilation of commerce JSP pages running...
[jasper2] 2005-08-31 10:59:41 - ERROR-the file
'/login-error.jsp' generated the following general exception:
java.lang.NullPointerException
I've seen reports that NPEs from this step are often classpath
related, but I've tried all the classpath variations that I can
think of to no avail.
I've used a <record> tag to record more details (appended
below), but that output isn't very useful; line 596 in the
JspC.java file doesn't appear to correspond to anything that
could throw an NPE, and it's not even in the right function.
Normally I'd suspect a modification in the Debian package, but
the diff file included in the Debian source package doesn't
include any changes to JspC.java.
One thing that the Debian package does do is restructure the
server/lib and common/lib jar files with symlinks to other
packages. I've tried building a single directory with physical
copies of all the jar files; no change.
Note that the JSPs compile and run properly when dynamically
loaded, and I had used a different precompile task earlier to
test the JSP compilation stage. That worked properly, but didn't
generate the appropriate web.xml fragments to actually load the
compiled JSPs, so I know that the JSPs are OK.
Is there any way to get better error reporting, so I can find out
what's actually wrong? Does anyone recognize this problem?
/apache/hosts/avguide.com/classes/build.xml:105:
org.apache.jasper.JasperException: Error compiling
/login-error.jsp
at
org.apache.tools.ant.TaskAdapter.execute(TaskAdapter.java:131)
at
org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:275)
at org.apache.tools.ant.Task.perform(Task.java:364)
at org.apache.tools.ant.Target.execute(Target.java:341)
at
org.apache.tools.ant.Target.performTasks(Target.java:369)
at
org.apache.tools.ant.Project.executeSortedTargets(Project.java:1216)
at
org.apache.tools.ant.Project.executeTarget(Project.java:1185)
at
org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:40)
at
org.apache.tools.ant.Project.executeTargets(Project.java:1068)
at org.apache.tools.ant.Main.runBuild(Main.java:668)
at org.apache.tools.ant.Main.startAnt(Main.java:187)
at
org.apache.tools.ant.launch.Launcher.run(Launcher.java:246)
at
org.apache.tools.ant.launch.Launcher.main(Launcher.java:67)
Caused by: org.apache.jasper.JasperException: Error compiling
/login-error.jsp
at org.apache.jasper.JspC.processFile(JspC.java:596)
at org.apache.jasper.JspC.execute(JspC.java:801)
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:324)
at
org.apache.tools.ant.TaskAdapter.execute(TaskAdapter.java:123)
... 12 more
--- Nested Exception ---
org.apache.jasper.JasperException: Error compiling
/login-error.jsp
at org.apache.jasper.JspC.processFile(JspC.java:596)
at org.apache.jasper.JspC.execute(JspC.java:801)
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:324)
at
org.apache.tools.ant.TaskAdapter.execute(TaskAdapter.java:123)
at
org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:275)
at org.apache.tools.ant.Task.perform(Task.java:364)
at org.apache.tools.ant.Target.execute(Target.java:341)
at
org.apache.tools.ant.Target.performTasks(Target.java:369)
at
org.apache.tools.ant.Project.executeSortedTargets(Project.java:1216)
at
org.apache.tools.ant.Project.executeTarget(Project.java:1185)
at
org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:40)
at
org.apache.tools.ant.Project.executeTargets(Project.java:1068)
at org.apache.tools.ant.Main.runBuild(Main.java:668)
at org.apache.tools.ant.Main.startAnt(Main.java:187)
at
org.apache.tools.ant.launch.Launcher.run(Launcher.java:246)
at
org.apache.tools.ant.launch.Launcher.main(Launcher.java:67)
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