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https://issues.apache.org/jira/browse/SLING-1809?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12965149#action_12965149
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Felix Meschberger commented on SLING-1809:
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I don't think we have to upgrade the compiler for this single reason because
the problem is only exhibited when compiling with target "jsr14". Since Sling
requires Java 5 there is no use compiling for the jsr14 target and thus this
issues needs not be fixed IMHO.
Note on the jsr14 target: This special (mostly undocumented) target has been
introduced while the new Java 5 language features have been developped. This
target accepts source level for Java 5 but generates Java 1.4 compatible class
files. This is mainly useful for generics, which are not erased anyway. For
Enums and Annotations this target is not really usefull because the Java 1.4
runtime library does not provide the required interfaces like java.lang.Enum.
> Eclipse compiler used in commons.compiler causes "Illegal type in constant
> pool" with enums
> -------------------------------------------------------------------------------------------
>
> Key: SLING-1809
> URL: https://issues.apache.org/jira/browse/SLING-1809
> Project: Sling
> Issue Type: Bug
> Components: Commons
> Affects Versions: Commons Compiler 2.0.0
> Reporter: Bertrand Delacretaz
>
> According to [0] the eclipse compiler can't handle enums in certain
> environments.
> The trunk org.apache.sling.commons.compiler bundle embeds (eclipse-jdt)
> core-3.3.0-v_771.jar which exposes this issue.
> According to [0] the issue should be fixed in v3.5.2, but the central Maven
> repository does not provide a more recent version than the one we currently
> use.
> To reproduce the problem, install the compiler and java scripting bundle and
> create a scripted java servlet that uses enums (example below), at runtime
> this causes:
> java.lang.VerifyError:
> (class: enumtest/EnumTest, method: valueOf signature:
> (Ljava/lang/String;)Lenumtest/EnumTest;)
> Illegal type in constant pool
> [0] https://bugs.eclipse.org/bugs/show_bug.cgi?id=291985
> Here's the example servlet, store in
> /apps/JavaScriptingTest2/JavaScriptingTest2.java and use "JavaScriptingTest2"
> resource type:
> package apps.JavaScriptingTest2;
> import javax.servlet.http.*;
> import java.io.IOException;
> public class JavaScriptingTest2 extends HttpServlet {
> static enum EnumTest { FOO, BAR };
>
> public void doGet(HttpServletRequest req, HttpServletResponse resp)
> throws IOException {
> resp.getWriter().write("FOO=" + EnumTest.FOO);
> }
> }
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