Index: api/src/org/netbeans/api/debugger/jpda/JPDADebugger.java
===================================================================
RCS file: /cvs/debuggerjpda/api/src/org/netbeans/api/debugger/jpda/JPDADebugger.java,v
retrieving revision 1.18
diff -u -r1.18 JPDADebugger.java
--- api/src/org/netbeans/api/debugger/jpda/JPDADebugger.java	12 Aug 2005 12:45:10 -0000	1.18
+++ api/src/org/netbeans/api/debugger/jpda/JPDADebugger.java	18 Oct 2005 13:07:46 -0000
@@ -322,6 +322,15 @@
      * @return <code>true</code> if this debugger supports Pop action
      */
     public abstract boolean canPopFrames ();
+    
+    /**
+     * Determines if the target debuggee can be modified.
+     *
+     * @return <code>true</code> if the target debuggee can be modified.
+     */
+    public boolean canBeModified() {
+        return true;
+    }
 
     /**
      * Implements fix & continue (HotSwap). Map should contain class names
Index: src/org/netbeans/modules/debugger/jpda/JPDADebuggerImpl.java
===================================================================
RCS file: /cvs/debuggerjpda/src/org/netbeans/modules/debugger/jpda/JPDADebuggerImpl.java,v
retrieving revision 1.86
diff -u -r1.86 JPDADebuggerImpl.java
--- src/org/netbeans/modules/debugger/jpda/JPDADebuggerImpl.java	17 Oct 2005 09:28:13 -0000	1.86
+++ src/org/netbeans/modules/debugger/jpda/JPDADebuggerImpl.java	18 Oct 2005 13:07:46 -0000
@@ -313,6 +313,33 @@
             
         }
     }
+    
+    private Boolean canBeModified;
+    private Object canBeModifiedLock = new Object();
+    
+    public boolean canBeModified() {
+        VirtualMachine vm = getVirtualMachine ();
+        if (vm == null) return false;
+        synchronized (canBeModifiedLock) {
+            if (canBeModified == null) {
+                try {
+                    java.lang.reflect.Method canBeModifiedMethod =
+                            com.sun.jdi.VirtualMachine.class.getMethod("canBeModified", new Class[] {});
+                    Object modifiable = canBeModifiedMethod.invoke(vm, new Object[] {});
+                    canBeModified = (Boolean) modifiable;
+                } catch (NoSuchMethodException nsmex) {
+                    // On JDK 1.4 we do not know... we suppose that can
+                    canBeModified = Boolean.TRUE;
+                } catch (IllegalAccessException iaex) {
+                    canBeModified = Boolean.TRUE;
+                } catch (InvocationTargetException itex) {
+                    canBeModified = Boolean.TRUE;
+                }
+            }
+            return canBeModified.booleanValue();
+        }
+        // return vm.canBeModified(); -- After we'll build on JDK 1.5
+    }
 
     private SmartSteppingFilter smartSteppingFilter;
 
@@ -640,6 +667,9 @@
             JPDAUtils.printFeatures (vm);
         }
         virtualMachine = vm;
+        synchronized (canBeModifiedLock) {
+            canBeModified = null; // Reset the can be modified flag
+        }
         
         initGenericsSupport ();