Eclipse throwing Exception on code completition-CodePudding

My eclipse shows the following error message if I press "CTRL SPACE"

The 'org.eclipse.jdt.ui.TemplateProposalComputer' proposal computer from the 'org.eclipse.jdt.ui' plug-in did not complete normally. The extension has thrown a runtime exception.

In the eclipse log I see the following Exception:

java.security.AccessControlException: access denied ("java.io.FilePermission" "/home/martin/Programme/eclipse/x64/edition_2021-03/configuration/org.eclipse.osgi/2969/0/.cp/icons/full/obj16/staged2465766773545443944.tmp" "write")
at java.base/java.security.AccessControlContext.checkPermission(AccessControlContext.java:472)
at java.base/java.security.AccessController.checkPermission(AccessController.java:897)
at java.base/java.lang.SecurityManager.checkPermission(SecurityManager.java:322)
at java.base/java.lang.SecurityManager.checkWrite(SecurityManager.java:752)
at ro.sync.security.manager.SandboxSecurityManager.checkWrite(SandboxSecurityManager.java:188)
at java.base/java.io.File.createTempFile(File.java:2082)
at org.eclipse.osgi.storage.BundleInfo$Generation.storeContent(BundleInfo.java:384)
at org.eclipse.osgi.storage.bundlefile.CloseableBundleFile.getFile(CloseableBundleFile.java:223)
at org.eclipse.osgi.storage.bundlefile.ZipBundleEntry.getFileURL(ZipBundleEntry.java:107)
at org.eclipse.osgi.storage.url.BundleURLConnection.getFileURL(BundleURLConnection.java:139)
at org.eclipse.osgi.storage.url.BundleURLConverter.toFileURL(BundleURLConverter.java:38)
at org.eclipse.core.runtime.FileLocator.toFileURL(FileLocator.java:261)
at org.eclipse.jface.resource.URLImageDescriptor.getFilePath(URLImageDescriptor.java:243)
at org.eclipse.jface.resource.URLImageDescriptor$URLImageFileNameProvider.getImagePath(URLImageDescriptor.java:58)
at org.eclipse.swt.internal.DPIUtil.validateAndGetImagePathAtZoom(DPIUtil.java:419)
at org.eclipse.swt.graphics.Image.<init>(Image.java:624)
at org.eclipse.jface.resource.URLImageDescriptor.createImage(URLImageDescriptor.java:274)
at org.eclipse.jface.resource.ImageDescriptor.createResource(ImageDescriptor.java:227)
at org.eclipse.jface.resource.DeviceResourceManager.allocate(DeviceResourceManager.java:55)
at org.eclipse.jface.resource.AbstractResourceManager.create(AbstractResourceManager.java:88)
at org.eclipse.jface.resource.ResourceManager.createImageWithDefault(ResourceManager.java:195)
at org.eclipse.jface.resource.ImageRegistry.get(ImageRegistry.java:206)
at org.eclipse.jdt.internal.ui.JavaPluginImages.get(JavaPluginImages.java:643)
at org.eclipse.jdt.internal.ui.text.template.contentassist.TemplateEngine.getImage(TemplateEngine.java:196)
at org.eclipse.jdt.internal.ui.text.template.contentassist.TemplateEngine.complete(TemplateEngine.java:160)
at org.eclipse.jdt.internal.ui.text.java.AbstractTemplateCompletionProposalComputer.computeCompletionProposals(AbstractTemplateCompletionProposalComputer.java:82)
at org.eclipse.jdt.internal.ui.text.java.CompletionProposalComputerDescriptor.computeCompletionProposals(CompletionProposalComputerDescriptor.java:348)
at org.eclipse.jdt.internal.ui.text.java.CompletionProposalCategory.computeCompletionProposals(CompletionProposalCategory.java:340)
at org.eclipse.jdt.internal.ui.text.java.ContentAssistProcessor.collectProposals(ContentAssistProcessor.java:333)
at org.eclipse.jdt.internal.ui.text.java.ContentAssistProcessor.computeCompletionProposals(ContentAssistProcessor.java:289)
at org.eclipse.jface.text.contentassist.AsyncCompletionProposalPopup.lambda$10(AsyncCompletionProposalPopup.java:352)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:45)
at org.eclipse.jface.text.contentassist.AsyncCompletionProposalPopup.lambda$9(AsyncCompletionProposalPopup.java:351)
at java.base/java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1700)
at java.base/java.util.concurrent.CompletableFuture$AsyncSupply.exec(CompletableFuture.java:1692)
at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:290)
at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1020)
at java.base/java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1656)
at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1594)
at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:177)

The mentioned directory /home/martin/Programme/eclipse/x64/edition_2021-03/configuration/org.eclipse.osgi/2969/0/.cp/icons/full/obj16/ exists and is writeable for my user. The outlined file do not exists. So what is the problem here?

I'm currently using eclipse 2021-09 RC1 but I remember I had this issue with the previous eclipse version too. If I disable "Template Proposals" in the content assist this message goes away. But this error can't be normal as this happens again if I reset the content assist to the default values. At least with the defaults Eclipse should always work as expected.

CodePudding user response：

Download page for eclipse 2021-09 RC1 clearly states

Please note that this is a developer build which might contain issues.

It might well be a bug on the development version. RC means Release Candidate.

Suggestions:

Use an stable release to reproduce the issue
Contribute a bug report for that version.
As a test/workaround, try disabling SWT template proposal

@howlger suggestion on reporting bugs:

Better report bugs that can be reproduced with a fresh installation of the latest releases candidate, milestone or even better the latest daily integration build than of the latest release.