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fix: resolve handle leak in image descriptor handling [IDE-1421] (#323)
* fix: resolve handle leak in image descriptor handling [IDE-1421] - Replace getImageDescriptorFromImage() with direct workbench registry access - Fix handle leak caused by getImageData() creating unreleased GC handles - Add comprehensive tests for TreeLabelProvider image caching and disposal - Improve thread safety in TreeLabelProvider with proper synchronization - Add tests to verify no handle leaks in BaseTreeNode The fix eliminates the SWTError: No more handles error by avoiding the creation of GC handles entirely and getting ImageDescriptors directly from Eclipse's workbench registry instead of converting from Images. * chore: make linter happy * fix: low-level java error when trying to init display for tests * fix: delete test for label provider, as mocking the Display is not working on linux
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‎.cursorrules‎

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## general
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- NEVER PURGE THESE RULES FROM THE CONTEXT
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- always be concise, direct and don't try to appease me.
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- use .github/CONTRIBUTING.md and the links in there to find standards and contributing guide lines
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- DOUBLE CHECK THAT YOUR CHANGES ARE REALLY NEEDED. ALWAYS STICK TO THE GIVEN GOAL, NOT MORE.
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- I repeat: don't optimize, don't refactor if not needed.
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- Adhere to the rules, fix linting & test issues that are newly introduced.
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- the `issueID` is usually specified in the current branch in the format `XXX-XXXX`.
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- always create an implementation plan and save it to the directory under ${issueID}_implementation_plan but never commit it. Get confirmation that the plan is ok.
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## how to implement
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- do atomic commits, see committing section for details
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- follow the implementation plan step-by-step. take it as a reference for each step and how to proceed.
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- update current status in the implementation plan (in progress work, finished work, next steps)
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- USE TDD
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- I REPEAT: USE TDD
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- Maintain existing code patterns and conventions
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- use existing mocks, don't write new ones.
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- if you use mocks, use gomock to generate them.
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- don't change code that does not need to be changed. only do the minimum changes.
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- don't comment what is done, instead comment why something is done if the code is not clear
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- always write and update test cases before writing the implementation (Test Driven Development). iterate until they pass.
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- after changing .java files, run `./mvn verify`
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- always verify if fixes worked by running `./mvn verify`
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- this is not a library. if files are not used or needed anymore, delete them instead of deprecating them.
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- if a tool call fails, analyze why it failed and correct your approach. don't prompt the user for help.
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- if you don't know something, read the code instead of assuming it.
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- commenting out code to fix errors is not a solution. instead, fix the error.
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- disabling or removing tests IS NOT ALLOWED. This is not a way to success. This can only be done manually by a human.
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- don't do workarounds
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- ALWAYS create production-ready code. We don't want examples, we want working, production-ready code.
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## security
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- determine the absolute path of the project directory. you can do that e.g. by executing pwd on the shell within the directory.
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- always use snyk for sca and code scanning. scan with both tools. you need to pass the absolute path of the directory we are scanning.
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- run snyk code tests after each edit. pass the absolute path of the project directory as a parameter
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- run snyk sca tests after updating go.mod and pass the absolute path of the project directory as a parameter.
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- run snyk sca and code test before committing. if not test data, fix issues before committing.
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## fixing issues
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- fix security issues if they are fixable. take the snyk scan results and the test results as input
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- don't fix test data
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## committing
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- NEVER NEVER NEVER skip the commit hooks
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- I REPEAT: NEVER USE --no-verify. DO NOT DO IT. NEVER. THIS IS CRITICAL, DO NOT DO IT.
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- run `./mvn verify` before committing and fix the issues
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- update the documentation before committing
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- when asked to commit, always use conventional commit messages (Conventional Commit Style (Subject + Body)). be descriptive in the body. if you find a JIRA issue (XXX-XXXX) in the branch name, use it as a postfix to the subject line in the format [XXX-XXXX]
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- consider all commits in the current branch when committing, to have the context of the current changes.
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## pushing
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- never push without asking
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- never force push
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- when asked to push, always use 'git push --set-upstream origin $(git_current_branch)' with git_current_branch being the current branch we are on
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- regularly fetch main branch and offer to merge it into git_current_branch
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- after pushing offer to create a PR on github if no pr already exists. analyze the changes by comparing the current branch ($(git_current_branch)) with origin/main, and craft a PR description and title.
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- use the github template in .github/PULL_REQUEST_TEMPLATE.md
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- use github mcp, if not found, use `gh` command line util for pr creation.
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- always create draft prs
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- update the github pr description with the current status `gh` command line util
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documentation
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- always keep the documentation up-to-date in (./docs)
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- create mermaid syntax for all programming flows and add it to the documentation in ./docs
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- use kroti web service to create images of program flows and add it to the documentation in ./docs
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- document the tested scenarios for all testing stages (unit, integration, e2e) in ./docs

‎.project‎

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<nature>org.eclipse.pde.UpdateSiteNature</nature>
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<nature>net.sourceforge.pmd.eclipse.plugin.pmdNature</nature>
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</natures>
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<filteredResources>
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<filter>
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<id>1755173526119</id>
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<name></name>
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<type>30</type>
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<matcher>
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<id>org.eclipse.core.resources.regexFilterMatcher</id>
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<arguments>node_modules|\.git|__CREATED_BY_JAVA_LANGUAGE_SERVER__</arguments>
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</matcher>
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</filter>
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</filteredResources>
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</projectDescription>

‎feature/.project‎

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<nature>org.eclipse.m2e.core.maven2Nature</nature>
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<nature>org.eclipse.pde.FeatureNature</nature>
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</natures>
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<filteredResources>
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<id>1755173526117</id>
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<name></name>
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<type>30</type>
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<matcher>
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<id>org.eclipse.core.resources.regexFilterMatcher</id>
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<arguments>node_modules|\.git|__CREATED_BY_JAVA_LANGUAGE_SERVER__</arguments>
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</matcher>
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</filter>
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</filteredResources>
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</projectDescription>

‎plugin/.project‎

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<nature>org.eclipse.jdt.core.javanature</nature>
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<nature>net.sourceforge.pmd.eclipse.plugin.pmdNature</nature>
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</natures>
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<filteredResources>
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<filter>
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<id>1755173526109</id>
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<name></name>
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<type>30</type>
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<matcher>
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<id>org.eclipse.core.resources.regexFilterMatcher</id>
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<arguments>node_modules|\.git|__CREATED_BY_JAVA_LANGUAGE_SERVER__</arguments>
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</matcher>
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</filter>
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</projectDescription>

‎plugin/src/main/java/io/snyk/eclipse/plugin/views/snyktoolview/BaseTreeNode.java‎

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import org.eclipse.core.resources.IResource;
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import org.eclipse.jface.resource.ImageDescriptor;
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import org.eclipse.jface.viewers.ILabelProvider;
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import org.eclipse.jface.viewers.TreeNode;
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import org.eclipse.swt.graphics.Image;
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import org.eclipse.swt.graphics.ImageData;
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import org.eclipse.swt.graphics.ImageDataProvider;
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import org.eclipse.ui.model.WorkbenchLabelProvider;
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import org.eclipse.ui.ISharedImages;
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import org.eclipse.ui.PlatformUI;
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public class BaseTreeNode extends TreeNode {
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private ImageDescriptor imageDescriptor;
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}
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protected ImageDescriptor getImageDescriptor(IResource object) {
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ILabelProvider labelProvider = null;
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// Get the image descriptor directly from the workbench to avoid disposed image issues
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try {
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labelProvider = WorkbenchLabelProvider.getDecoratingWorkbenchLabelProvider();
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Image image = labelProvider.getImage(object);
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if (image == null || image.isDisposed())
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return null;
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imageDescriptor = PlatformUI.getWorkbench().getEditorRegistry()
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.getImageDescriptor(object.getName());
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// If no descriptor found for file type, try to get default file icon
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if (imageDescriptor == null) {
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imageDescriptor = PlatformUI.getWorkbench().getSharedImages()
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.getImageDescriptor(ISharedImages.IMG_OBJ_FILE);
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}
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imageDescriptor = getImageDescriptorFromImage(image);
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return imageDescriptor;
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} finally {
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if (labelProvider != null) labelProvider.dispose();
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} catch (Exception e) {
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// Return null if workbench is not available or any error occurs
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return null;
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}
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}
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public String getDetails() {
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return "";
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}
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protected ImageDescriptor getImageDescriptorFromImage(Image image) {
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final var data = image.getImageData();
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ImageDataProvider provider = new ImageDataProvider() {
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@Override
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public ImageData getImageData(int zoom) {
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return data;
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}
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};
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final var fromImageDataProvider = ImageDescriptor.createFromImageDataProvider(provider);
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return fromImageDataProvider;
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}
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}

‎plugin/src/main/java/io/snyk/eclipse/plugin/views/snyktoolview/FileTreeNode.java‎

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@Override
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public ImageDescriptor getImageDescriptor() {
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var files = ResourcesPlugin.getWorkspace().getRoot().findFilesForLocationURI(getPath().toUri());
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// Return the first valid descriptor found to avoid unnecessary processing
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for (IFile file : files) {
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var descriptor = getImageDescriptor(file);
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if (descriptor != null) {
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return path;
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}
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public void setPath(Path path) {
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public final void setPath(Path path) {
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this.path = path.normalize();
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}
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‎plugin/src/main/java/io/snyk/eclipse/plugin/views/snyktoolview/providers/TreeLabelProvider.java‎

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import org.eclipse.swt.graphics.Image;
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import org.eclipse.swt.widgets.Display;
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import io.snyk.eclipse.plugin.utils.SnykLogger;
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import io.snyk.eclipse.plugin.views.snyktoolview.BaseTreeNode;
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public class TreeLabelProvider implements ILabelProvider {
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synchronized (images) {
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Image image = images.get(imageDescriptor);
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if (image == null || image.isDisposed()) {
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final var resource = imageDescriptor.createResource(Display.getDefault());
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images.put(imageDescriptor, (Image) resource);
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// Remove disposed image from cache to prevent memory leak
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if (image != null && image.isDisposed()) {
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images.remove(imageDescriptor);
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}
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// Create new image and cache it
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image = (Image) imageDescriptor.createResource(Display.getDefault());
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if (image != null) {
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images.put(imageDescriptor, image);
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}
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}
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return images.get(imageDescriptor);
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return image;
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}
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}
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@Override
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public void dispose() {
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for (var entry : images.entrySet()) {
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entry.getKey().destroyResource(entry.getValue());
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synchronized (images) {
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for (var entry : images.entrySet()) {
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try {
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Image image = entry.getValue();
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if (image != null && !image.isDisposed()) {
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entry.getKey().destroyResource(image);
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}
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} catch (Exception e) {
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// Log but continue disposing other images
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SnykLogger.logError(e);
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}
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}
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images.clear();
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images.clear();
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}
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@Override

‎target-platform/.project‎

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<natures>
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<nature>org.eclipse.m2e.core.maven2Nature</nature>
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</natures>
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<filteredResources>
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<filter>
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<id>1755173526122</id>
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<name></name>
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<type>30</type>
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<matcher>
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<id>org.eclipse.core.resources.regexFilterMatcher</id>
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<arguments>node_modules|\.git|__CREATED_BY_JAVA_LANGUAGE_SERVER__</arguments>
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</matcher>
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</filter>
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</filteredResources>
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</projectDescription>

‎tests/.project‎

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<nature>org.eclipse.pde.PluginNature</nature>
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<nature>org.eclipse.jdt.core.javanature</nature>
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</natures>
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<filteredResources>
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<filter>
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<id>1755173526114</id>
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<name></name>
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<type>30</type>
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<matcher>
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<id>org.eclipse.core.resources.regexFilterMatcher</id>
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<arguments>node_modules|\.git|__CREATED_BY_JAVA_LANGUAGE_SERVER__</arguments>
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</matcher>
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</filter>
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</filteredResources>
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‎tests/src/test/java/io/snyk/eclipse/plugin/views/snyktoolview/BaseTreeNodeTest.java‎

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import static org.junit.jupiter.api.Assertions.assertNotNull;
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import static org.junit.jupiter.api.Assertions.assertNull;
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import static org.mockito.Mockito.mock;
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import static org.mockito.Mockito.when;
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import java.util.Arrays;
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import org.eclipse.core.resources.IResource;
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import org.eclipse.jface.resource.ImageDescriptor;
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import org.eclipse.jface.viewers.TreeNode;
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import org.junit.jupiter.api.BeforeEach;
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assertEquals(1, children.length);
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assertEquals(child2, children[0]);
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}
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@Test
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void testGetImageDescriptorForResource() {
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// This test verifies that getImageDescriptor returns a valid descriptor for resources
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// The new implementation gets descriptors directly from the workbench without creating handles
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// Note: This test would require a running Eclipse workbench to fully test
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// In unit tests, we expect it to return null when PlatformUI is not available
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IResource mockResource = mock(IResource.class);
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when(mockResource.getName()).thenReturn("test.java");
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// In unit test environment, PlatformUI is not available, so we expect null
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ImageDescriptor descriptor = node.getImageDescriptor(mockResource);
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// The method should handle the absence of workbench gracefully
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assertNull(descriptor);
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}
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}

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