[SOLVED] CompositeELResolver Null Pointer Exception

CompositeELResolver Null Pointer Exception

I've got a problem with "javax.el.CompositeELResolver" which is used by TomEE's "javaee-api-6.0-5.jar".

Version information and svn-repository here:
http://mvnrepository.com/artifact/org.apache.geronimo.specs/geronimo-el_2.2_spec/1.0.2

Source of class CompositeELResolver here:
http://svn.apache.org/viewvc/geronimo/specs/tags/geronimo-el_2.2_spec-1.0.2/src/main/java/javax/el/CompositeELResolver.java?view=log

In the "invoke" method I get a null pointer exception because the for-loop iterates through the whole resolvers-array which has got fields with value "null". I suppose this is not avoidable because of the "add" method that doubles the array size if required but does not initialize any values. Shouldn't there be a check if the resolver is "null" in the "invoke" method before using it?

For comparison I ran my application with another javax.el implementation and it's working properly:

<dependency>
  <groupId>javax.el</groupId>
  <artifactId>el-api</artifactId>
  <version>2.2</version>
</dependency>

Am I wrong with my supposition?

I found a similar-sounding issue here: https://issues.apache.org/bugzilla/show_bug.cgi?id=50293

Is it possible that multi-threading causes my problem?

Solution