Rob,
On 5/1/23 17:12, Rob Sargent wrote:
=> On 5/1/23 14:36, Christopher Schultz wrote:
Jeremy,
On 5/1/23 14:22, Jeremy Nguyen wrote:
I'm trying to upgrade Tomcat 8 to 8.5 and I'm getting a
nullpointerexception within
WebappClassLoaderBase.CombinedEnumeration.inc.
It seems to occur when it's trying to initialize commons-logging
LogFactory
for any class specified in Web.xml, and it's calling
getResources("commons-logging.properties") which I never had. Is it
required in 8.5? Even if I put it in conf/, it's not being picked up.
We're running Tomcat using a wrapper and it's erroring out here:
https://github.com/CodeGerm/osgi-server/blob/master/plugins/org.cg.dao.webcontainer/src/org/cg/dao/webcontainer/tomcat/TomcatWrapper.java#L185
I posted my web.xml and error trace here as well:
https://stackoverflow.com/questions/76139108/web-xml-configuration-is-broken-when-upgrading-to-tomcat-8-5-and-spring-5-1
I have no idea how this is throwing an NPE. The only pointer being
dereferenced by the inc() method is "sources":
2773 private boolean inc() {
2774 while (index < sources.length) {
2775 if (sources[index].hasMoreElements()) {
2776 return true;
2777 }
2778 index++;
2779 }
2780 return false;
2781 }
That member (sources) is instantiated in the one-and-only-one
constructor:
CombinedEnumeration(Enumeration<URL> enum1, Enumeration<URL>
enum2) {
@SuppressWarnings("unchecked")
Enumeration<URL>[] sources = new Enumeration[] { enum1,
enum2 };
this.sources = sources;
}
Also weird is that this throws NPE on line 2775 and not 2774. I can't
explain how line 2775 could throw an NPE if line 2774 did not.
>:/
Is the null pointer in the index'th position of source, not source itself?
Possibly (and it's really the only probable cause), but the
documentation for getResources() and findResources() (both of which are
used to assemble the CombinedEnumeration in the first place) say that if
no resources are found, an empty Enumeration is returned, not null.
-chris
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