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Strange compilation problems with com.sun.jdi.* classes on Gerrit [message #1692934]

Mon, 20 April 2015 16:56

Tamas Szabo

Messages: 12
Registered: June 2013

Junior Member

Context: I am implementing my own Variables View in Eclipse, which will be populated with my custom debug variables.

In order to do this I am heavily using the org.eclipse.debug.* and org.eclipse.jdt.debug plugins along with some classes directly coming from the JDK (com.sun.jdi.ArrayReference, com.sun.jdi.Value, etc).

Consider the ArrayReference class for now:
As of JDK 1.6 this class uses generics, as you can see for example here: http://grepcode.com/file/repository.grepcode.com/java/root/jdk/openjdk/6-b14/com/sun/jdi/ArrayReference.java
My code uses this class, for example I am accessing array members through the getValues call (which returns a List<Value>). Now, if I compile this code within Eclipse on OSX/Windows/Linux this works just fine. However, if I push my changes to Gerrit, I always get a compilation problem. I have highlighted some relevant parts of the console output:

...
[/opt/public/common/jdk1.6.0_45/jre/bin/java, -jar, /jobs/genie.incquery/incquery-master-gerrit/workspace/.maven/repo/p2/osgi/bundle/org.eclipse.equinox.launcher (this is important for the Java version)
...
[ERROR] /jobs/genie.incquery/incquery-master-gerrit/workspace/plugins/org.eclipse.incquery.tooling.debug/src/org/eclipse/incquery/tooling/debug/variables/values/MatcherValue.java:[66]
[ERROR] for (Value match : ((ArrayReference) matches.getValue()).getValues()) {
[ERROR] ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[ERROR] Type mismatch: cannot convert from element type Object to Value

Here, the matches.getValue() returns an ArrayReference (at least content assist says that inside Eclipse), and then I would call getValues() on this to iterate over the values. This is where the compilation problem happens. I checked my local JDK (both 1.6 and 1. Cool

and they provide this class with generics, which is not quite surprising.

Could somebody maybe point me to the right direction about what is going on here? I would appreciate any help.

[Updated on: Mon, 20 April 2015 17:00]

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Re: Strange compilation problems with com.sun.jdi.* classes on Gerrit [message #1692935 is a reply to message #1692934]

Mon, 20 April 2015 17:10

Stephan Herrmann

Messages: 1853
Registered: July 2009

Senior Member

I guess you need to find out against which exact JRE you are compiling on the CI server. Knowing the JRE driving the build is one ingredient to this riddle. Depending on you build technology (tycho?) using a properly configured toolchains.xml could have an impact, too.
mvn -X should reveal the actual locations used by the compiler.

Stephan

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