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Re: [cdt-dev] Created make targets not saved to .cproject

One more plea for help ;-)
I tried to implement a workaround now, to force a rewriting of the .cproject after my modifications. This code compiles fine:
        monitor.setTaskName("saving changes");
        for (IProject project : changedProjects) {
            ICProjectDescription des = CCorePlugin.getDefault().getProjectDescription(project, true);
            System.out.println("SAVE " + project.getName());
            if (des != null) {
                System.out.println("  ++" + project.getName());
                CCorePlugin.getDefault().setProjectDescription(project, des, true, monitor);
            }
        }
        monitor.done();
When running in the PDE runtime workbench, all is fine (well, it still does not save, but the code is running fine).
But when I export the plugin and install it into my regular Eclipse installation, I get this exception:

java.lang.NoClassDefFoundError: org/eclipse/cdt/core/CCorePlugin
at com.siemens.cropet.maketargets.Maketargetbuilder.updateMakeTargets(Maketargetbuilder.java:254)
at com.siemens.cropet.maketargets.Maketargetbuilder.access$3(Maketargetbuilder.java:232)
at com.siemens.cropet.maketargets.Maketargetbuilder$2.run(Maketargetbuilder.java:70)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)

I guess this is some very basic handling error on my side, but I encounter that for the first time. Any idea what's missing?
This is my plugin.xml and manifest:

<?xml version="1.0" encoding="UTF-8"?>
<?eclipse version="3.2"?>
<plugin>
   <extension
         point="org.eclipse.ui.startup">
      <startup
            class="com.siemens.cropet.maketargets.Maketargetbuilder">
      </startup>
   </extension>
   <extension
         point="org.eclipse.ui.preferencePages">
      <page
            class="com.siemens.cropet.maketargets.preferences.MaketargetsPreferencePage"
            id="com.siemens.cropet.maketargets.preferences.MaketargetsPreferencePage"
            category="org.eclipse.cdt.make.ui.preferences.MakePreferencePage"
            name="Maketarget creation">
      </page>
   </extension>
   <extension
         point="org.eclipse.core.runtime.preferences">
      <initializer
            class="com.siemens.cropet.maketargets.preferences.PreferenceInitializer">
      </initializer>
   </extension>
   <extension
         point="org.eclipse.ui.popupMenus">
      <objectContribution
            adaptable="true"
            id="com.siemens.cropet.maketargets.popup"
            objectClass="org.eclipse.core.resources.IResource">
         <action
               class="com.siemens.cropet.maketargets.popup.actions.CreateMaketargets"
               id="com.siemens.cropet.maketargets.autocreate"
               label="Auto-create for project..."
               menubarPath="org.eclipse.cdt.make.ui.menu/gm1">
         </action>
         <visibility>
               <or>
            <and>
               <objectClass
                     name="org.eclipse.core.resources.IFolder">
               </objectClass>
            <not>
               <or>
                  <objectState
                        name="name"
                        value="src">
                  </objectState>
                  <objectState
                        name="name"
                        value="h">
                  </objectState>
               </or>
            </not>
            </and>
            <and>
               <objectClass
                     name="org.eclipse.core.resources.IFile">
               </objectClass>
               <objectState
                     name="name"
                     value="Imakefile">
               </objectState>
            </and>
               </or>
         </visibility>
      </objectContribution>
   </extension>

</plugin>

Manifest-Version: 1.0
Bundle-ManifestVersion: 2
Bundle-Name: CroPET MakeTargets Plug-in
Bundle-SymbolicName: com.siemens.cropet.maketargets;singleton:=true
Bundle-Version: 1.3.0
Bundle-Activator: com.siemens.cropet.maketargets.Activator
Bundle-Vendor: Siemens AG, I DT MC
Export-Package: com.siemens.cropet.maketargets,
 com.siemens.cropet.maketargets.popup.actions,
 com.siemens.cropet.maketargets.preferences
Require-Bundle: org.eclipse.cdt.make.core,
 org.eclipse.core.runtime.compatibility,
 org.eclipse.core.resources,
 org.eclipse.ui,
 org.eclipse.core.runtime,
 org.eclipse.cdt.make.ui;bundle-version="5.0.0",
 org.eclipse.cdt.core;bundle-version="5.0.0"
Bundle-RequiredExecutionEnvironment: J2SE-1.5
Plugin-Class: com.siemens.cropet.maketargets.Activator
Bundle-ActivationPolicy: lazy


Thanks for any help.
-Achim

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