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Build Identifier: org.eclipse.wst.server.core.internal.ServerWorkingCopy.save(boolean, IProgressMonitor) will call org.eclipse.wst.server.core.internal.Server.setInternal(ServerWorkingCopy) which set the ServerWorkingCopy's modules array to the original Server's modules array. However, the ServerWorkingCopy's modules array is always null. Therefore, the org.eclipse.wst.server.core.internal.ServerWorkingCopy.save(boolean, IProgressMonitor) unexpectedly empties the Server's modules array. Reproducible: Always
Created attachment 248261 [details] Full stacktrace of NPE from log
Created attachment 248262 [details] org.eclipse.wst.server.core.prefs before restarting eclipse This is .metadata/.plugins/org.eclipse.core.runtime/.settings/org.eclipse.wst.server.core.prefs once a Tomcat 7 server runtime has been selected in Eclipse.
Created attachment 248263 [details] org.eclipse.wst.server.core.prefs This is .plugins/org.eclipse.core.runtime/.settings/org.eclipse.wst.server.core.prefs after restarting Eclipse. The tomcat 7 information is now gone.
Using: * Eclipse Java Web Developer Tools 3.6.1.v201409111852 org.eclipse.jst.web_ui.feature.feature.group Eclipse Web Tools Platform * Eclipse Luna SR1 (4.4.1) Build id: v20141016-0854-gg6 To reproduce: ------------- * In Eclipse, create two or more Servers via the Servers View (Right-click > New > Server, etc), with any webapp(s). Choose Tomcat 7 as your server runtime environment. It doesn't matter whether your servers use the same or a different one to reproduce this bug. * Restart Eclipse. Expected result: ---------------- Both servers still exist as before, unchanged. Actual result: -------------- One or more of the servers will have lost its "Runtime Environment". The "Runtime Environment" link is inactive. Furthermore: * If you click the Modules tab and remove the webapp you added, then attempt to save this change, you get a NullPointerException dialog. In the .log file is this exception (full stacktrace is attached): java.lang.NullPointerException at org.eclipse.jst.server.tomcat.ui.internal.editor.ServerLocationEditorSection.getSaveStatus(ServerLocationEditorSection.java:534) Workaround ---------- * Don't attempt to remove the webapp as above. * Window > Preferences > Server > Runtime Environment * Click Add... * Add a tomcat 7 runtime environment (choose Apache > Apache Tomcat v7.0, Finish" * Click OK to exit Preferences * In Servers view, double-click a server that is missing a "Runtime Environment" * Its "Runtime Environment" menu now contains the runtime you just added: select it. * Repeat for each server without a "Runtime Environment" * File > Save All Notes: ------ What is happening when you restart Eclipse is that the .metadata/.plugins/org.eclipse.core.runtime/.settings/org.eclipse.wst.server.core.prefs file is being overwritten, losing all the config information in it. (Astonishingly, chmod-ing it to read only, even changing the owner, doesn't work: Eclipse just makes it writable again by the user and overwrites it!) Two files are attached: a org.eclipse.wst.server.core.prefs before and after an Eclipse restart.
