AW: java.lang.ClassFormatError

[Andreas Bobek]

I really don't get it, here is how I can reproduce this error:

Shop => Servlet
_Basket => Superclass
Basket => Subclass

Basket has no additional declarations.

Shop creates a new Basket (within doGet...):

Basket basket = (Basket)
DataContext.createDataContext().createAndRegisterNewObject(Basket.class);

_Basket contains this additional method (please don't care of the sense of
this code, it is here for demonstration only, this code is even never
called):

        public String test() {
                String name = ((DbAttribute)
Configuration.getSharedConfiguration()
        
.getDomain("na-domain").getMap("Basket").getObjEntity("Basket")
                        .getDbEntity().getPrimaryKey().get(0)).getName();
                return (getObjectId().getIdSnapshot().get(name).toString());
        }


Scenario 1: as described above => ClassFormatError (see below)

Scenario 2: slightly modified the test method in _Basket:

        public String test() {
                Configuration conf = Configuration.getSharedConfiguration();
                String name = ((DbAttribute) conf
        
.getDomain("na-domain").getMap("Basket").getObjEntity("Basket")
                        .getDbEntity().getPrimaryKey().get(0)).getName();
                return (getObjectId().getIdSnapshot().get(name).toString());
        }

=> it works!

Scenario 3: remove the creation of the new Basket object in Shop servlet =>
it works independent of what is desclared in _Basket. I suppose this is
because the class is never loaded.


The stack trace:

java.lang.ClassFormatError: Invalid this class index 2414 in constant pool
in class file test/cayenne/_Basket
        java.lang.ClassLoader.defineClass1(Native Method)
        java.lang.ClassLoader.defineClass(Unknown Source)
        java.security.SecureClassLoader.defineClass(Unknown Source)
        
org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLo
ader.java:1629)
        
org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.jav
a:850)
        
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.jav
a:1299)
        
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.jav
a:1181)
        java.lang.ClassLoader.loadClassInternal(Unknown Source)
        java.lang.ClassLoader.defineClass1(Native Method)
        java.lang.ClassLoader.defineClass(Unknown Source)
        java.security.SecureClassLoader.defineClass(Unknown Source)
        
org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLo
ader.java:1629)
        
org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.jav
a:850)
        
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.jav
a:1299)
        
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.jav
a:1181)
        java.lang.ClassLoader.loadClassInternal(Unknown Source)
        test.Shop.serveEmptyForm(Shop.java:75)
        test.Shop.doGet(Shop.java:47)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:802)


I suppose it is a version issue.
Tested on three machines, tomcat 5.5, jdk 1.5, cayenne 2.0.4

Thanks, Andreas.