Debugging in Eclipse: checking variables & # 8594; errors during evaluation

I am working on a piece of Java code and I have a dump problem. I'm doing some debugging and don't know why, when I try to evaluate (observe or inspect) some variables declared inside a method, the following error is displayed:

errors during the evaluation.

      

        
        
        
      

    

I do not understand. I am using Eclipse 3.7.

For example, it does the same even for method parameters (which must be available until the end of the method execution). I think this is very strange and I cannot debug my code.

My eclipse.ini file:

-startup
plugins/org.eclipse.equinox.launcher_1.2.0.v20110502.jar
--launcher.library
plugins/org.eclipse.equinox.launcher.win32.win32.x86_64_1.1.100.v20110502
-product
org.eclipse.epp.package.jee.product
--launcher.defaultAction
openFile
--launcher.XXMaxPermSize
1024M
-showsplash
org.eclipse.platform
--launcher.XXMaxPermSize
512m
--launcher.defaultAction
openFile
-vmargs
-Dosgi.requiredJavaVersion=1.5
-Xms40m
-Xmx1024M