FULL PRODUCT VERSION :
java version "1.7.0_02"
Java(TM) SE Runtime Environment (build 1.7.0_02-b13)
Java HotSpot(TM) 64-Bit Server VM (build 22.0-b10, mixed mode)


ADDITIONAL OS VERSION INFORMATION :
Linux Frank.schruefer.lan 2.6.34.10-0.2-desktop #1 SMP PREEMPT 2011-07-20 18:48:56 +0200 x86_64 x86_64 x86_64 GNU/Linux

A DESCRIPTION OF THE PROBLEM :
While trying to get a hashcode from an object found via the reflection API the following expception is thrown:

java.lang.NullPointerException: null
   at javax.management.MBeanAttributeInfo.hashCode(MBeanAttributeInfo.java:304)
   at javax.management.MBeanInfo.arrayHashCode(MBeanInfo.java:532)
   at javax.management.MBeanInfo.hashCode(MBeanInfo.java:518)
   at com.sfs.util.HashList.containsObject(HashList.java:37)
   at com.sfs.lang.Memory.getMemoryUsageDeep(Memory.java:63)
   [...SNIP...]
   at com.sfs.siteforum.server.Service.service(Service.java:355)
   at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)


EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Get any integer returned.
ACTUAL -
Exception.

ERROR MESSAGES/STACK TRACES THAT OCCUR :
1250165441993-20120224110146964 TYPE: java.lang.NullPointerException
1250165441993-20120224110146964 TEXT: null
1250165441993-20120224110146964 JAVA: at javax.management.MBeanAttributeInfo.hashCode(MBeanAttributeInfo.java:304)
1250165441993-20120224110146964 JAVA: at javax.management.MBeanInfo.arrayHashCode(MBeanInfo.java:532)
1250165441993-20120224110146964 JAVA: at javax.management.MBeanInfo.hashCode(MBeanInfo.java:518)
1250165441993-20120224110146964 JAVA: at com.sfs.util.HashList.containsObject(HashList.java:37)
1250165441993-20120224110146964 JAVA: at com.sfs.lang.Memory.getMemoryUsageDeep(Memory.java:63)
1250165441993-20120224110146964 JAVA: at com.sfs.lang.Memory.getMemoryUsageDeep(Memory.java:82)
1250165441993-20120224110146964 JAVA: at com.sfs.lang.Memory.getMemoryUsageDeep(Memory.java:82)
1250165441993-20120224110146964 JAVA: at com.sfs.lang.Memory.getMemoryUsageDeep(Memory.java:82)
1250165441993-20120224110146964 JAVA: at com.sfs.lang.Memory.getMemoryUsageDeep(Memory.java:70)
1250165441993-20120224110146964 JAVA: at com.sfs.lang.Memory.getMemoryUsageDeep(Memory.java:82)
1250165441993-20120224110146964 JAVA: at com.sfs.lang.Memory.getMemoryUsageDeep(Memory.java:82)
1250165441993-20120224110146964 JAVA: at com.sfs.lang.Memory.getMemoryUsageDeep(Memory.java:82)
1250165441993-20120224110146964 JAVA: at com.sfs.lang.Memory.getMemoryUsageDeep(Memory.java:82)
1250165441993-20120224110146964 JAVA: at com.sfs.lang.Memory.getMemoryUsageDeep(Memory.java:82)
1250165441993-20120224110146964 JAVA: at com.sfs.lang.Memory.getMemoryUsageDeep(Memory.java:70)
1250165441993-20120224110146964 JAVA: at com.sfs.lang.Memory.getMemoryUsageDeep(Memory.java:82)
1250165441993-20120224110146964 JAVA: at com.sfs.lang.Memory.getMemoryUsageDeep(Memory.java:82)
1250165441993-20120224110146964 JAVA: at com.sfs.lang.Memory.getMemoryUsageDeep(Memory.java:70)
1250165441993-20120224110146964 JAVA: at com.sfs.lang.Memory.getMemoryUsageDeep(Memory.java:82)
1250165441993-20120224110146964 JAVA: at com.sfs.lang.Memory.getMemoryUsageDeep(Memory.java:82)
1250165441993-20120224110146964 JAVA: at com.sfs.lang.Memory.getMemoryUsageDeep(Memory.java:82)
1250165441993-20120224110146964 JAVA: at com.sfs.lang.Memory.getMemoryUsageDeep(Memory.java:82)
1250165441993-20120224110146964 JAVA: at com.sfs.lang.Memory.getMemoryUsageDeep(Memory.java:82)
1250165441993-20120224110146964 JAVA: at com.sfs.lang.Memory.getMemoryUsageDeep(Memory.java:82)
1250165441993-20120224110146964 JAVA: at com.sfs.lang.Memory.getMemoryUsageDeep(Memory.java:82)
1250165441993-20120224110146964 JAVA: at com.sfs.lang.Memory.getMemoryUsageDeep(Memory.java:82)
1250165441993-20120224110146964 JAVA: at com.sfs.lang.Memory.getMemoryUsageDeep(Memory.java:82)
1250165441993-20120224110146964 JAVA: at com.sfs.lang.Memory.getMemoryUsageDeep(Memory.java:70)
1250165441993-20120224110146964 JAVA: at com.sfs.lang.Memory.getMemoryUsageDeep(Memory.java:82)
1250165441993-20120224110146964 JAVA: at com.sfs.lang.Memory.getMemoryUsageDeep(Memory.java:82)
1250165441993-20120224110146964 JAVA: at com.sfs.lang.Memory.getMemoryUsageDeep(Memory.java:82)
1250165441993-20120224110146964 JAVA: at com.sfs.lang.Memory.getMemoryUsageDeep(Memory.java:82)
1250165441993-20120224110146964 JAVA: at com.sfs.lang.Memory.getMemoryUsageDeep(Memory.java:82)
1250165441993-20120224110146964 JAVA: at com.sfs.lang.Memory.getMemoryUsageDeep(Memory.java:82)
1250165441993-20120224110146964 JAVA: at com.sfs.lang.Memory.getMemoryUsageDeep(Memory.java:82)
1250165441993-20120224110146964 JAVA: at com.sfs.lang.Memory.getMemoryUsageDeep(Memory.java:54)
1250165441993-20120224110146964 JAVA: at com.sfs.lang.Memory.getMemoryUsage(Memory.java:42)
1250165441993-20120224110146964 JAVA: at com.sfs.siteforum.server.script.functions.Data.invoke_getMemoryUsageOfConnection(Data.java:255)
1250165441993-20120224110146964 JAVA: at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
1250165441993-20120224110146964 JAVA: at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
1250165441993-20120224110146964 JAVA: at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
1250165441993-20120224110146964 JAVA: at java.lang.reflect.Method.invoke(Method.java:601)
1250165441993-20120224110146964 JAVA: at com.sfs.siteforum.server.script.FunctionContent.invokeImpl(FunctionContent.java:171)
1250165441993-20120224110146964 JAVA: at com.sfs.siteforum.server.script.FunctionContent.invoke(FunctionContent.java:153)
1250165441993-20120224110146964 JAVA: at com.sfs.siteforum.server.script.AbstractContent.execute(AbstractContent.java:239)
1250165441993-20120224110146964 JAVA: at com.sfs.siteforum.server.tree.Connection.execute_work(Connection.java:515)
1250165441993-20120224110146964 JAVA: at com.sfs.siteforum.server.tree.RootBranch.service_exec(RootBranch.java:294)
1250165441993-20120224110146964 JAVA: at com.sfs.siteforum.server.tree.RootBranch.service(RootBranch.java:219)
1250165441993-20120224110146964 JAVA: at com.sfs.siteforum.server.Service.service(Service.java:355)
1250165441993-20120224110146964 JAVA: at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)


REPRODUCIBILITY :
This bug can be reproduced always.
Steps to Reproduce (be specific):

Testcase source code:

-------------- SNIP --------------------
import javax.management.*;

public class Temp {

   public final static void main(String[] args) throws Exception {
      new MBeanAttributeInfo(null, null, null, true, true, false).hashCode();
      }

   }
-------------- /SNIP --------------------



java -classpath . Temp


Expected: execute without exception

Actual: Nullpointer exception:

Exception in thread "main" java.lang.NullPointerException
        at javax.management.MBeanAttributeInfo.hashCode(MBeanAttributeInfo.java:304)
        at Temp.main(Temp.java:6)


In this case there's just one line of sourcecode in the method and the
checks for null are missing:

-------- ACTUAL CODE (jdk1.7.0_02) ----------
    public int hashCode() {
        return getName().hashCode() ^ getType().hashCode();
-------- /ACTUAL CODE -------------

------- SUGGESTED CODE ------------
    public int hashCode() {
        String n = getName();
        String t = getType();
        return (n == null ? 0 : n.hashCode()) ^ (t == null ? 0 : t.hashCode());
------- /SUGGESTED CODE -----------