https://issues.apache.org/bugzilla/show_bug.cgi?id=57172
Bug ID: 57172
Summary: NullPointerException in findResources of
WebappClassLoader
Product: Tomcat 8
Version: 8.0.14
Hardware: PC
Status: NEW
Severity: normal
Priority: P2
Component: Catalina
Assignee: [email protected]
Reporter: [email protected]
Enumeration<URL> findResources(String name) of class
org.apache.catalina.loader.WebappClassLoaderBase (for Tomcat 8.0.14, the code
was located in org.apache.catalina.loader.WebappClassLoader for Tomcat 8.0.12)
throws a NullPointerException if the "resources" attribute is null.
I'm unsure why it is null in some cases (restarting the server, instead of
simply redeploying one of our apps, fixes the issue for us) but this should be
fixed in the classloader implementation anyway.
The code looks like this
WebResource[] webResources = resources.getClassLoaderResources(path);
for (WebResource webResource : webResources) {
if (webResource.exists()) {
result.add(webResource.getURL());
}
}
and should be replaced by
if (resources != null) {
WebResource[] webResources =
resources.getClassLoaderResources(path);
for (WebResource webResource : webResources) {
if (webResource.exists()) {
result.add(webResource.getURL());
}
}
}
Searching for this problem returns results as old as 2006.
Other code that's using "resources" without null check:
public boolean modified()
public void start()
protected ResourceEntry findResourceInternal(final String name, final
String path)
Code that already acknowledges that "resources" may be null:
public String getContextName() {
if (resources == null) {
return "Unknown";
} else {
return resources.getContext().getName();
}
}
Full stacktrace of our specific issue (running on Tomcat 8.0.12):
java.lang.NullPointerException
at
org.apache.catalina.loader.WebappClassLoader.findResources(WebappClassLoader.java:998)
at java.lang.ClassLoader.getResources(ClassLoader.java:1139)
at
java.util.ServiceLoader$LazyIterator.hasNextService(ServiceLoader.java:348)
at java.util.ServiceLoader$LazyIterator.hasNext(ServiceLoader.java:393)
at java.util.ServiceLoader$1.hasNext(ServiceLoader.java:474)
at javax.xml.stream.FactoryFinder$1.run(FactoryFinder.java:352)
at java.security.AccessController.doPrivileged(Native Method)
at
javax.xml.stream.FactoryFinder.findServiceProvider(FactoryFinder.java:341)
at javax.xml.stream.FactoryFinder.find(FactoryFinder.java:313)
at javax.xml.stream.FactoryFinder.find(FactoryFinder.java:227)
at javax.xml.stream.XMLInputFactory.newFactory(XMLInputFactory.java:205)
The XMLInputFactory.newFactory() is executed in initialValue() of a
ThreadLocal<XMLInputFactory>.
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