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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"macOS: JDTLS java process shows “Not Responding” in Activity Monitor","articleBody":"\u003cimg width=\"903\" height=\"567\" alt=\"Image\" src=\"https://github.com/user-attachments/assets/a6cd717c-b9db-45c0-b34d-27c94a271b1d\" /\u003e\n\n**Environment**\n- macOS version: `26.1`\n- Extension: Language Support for Java(TM) by Red Hat version: `1.50.0`\n- JDK used by JDTLS (`java -version` and/or `ps` command line): `21.0.9-macosx-aarch64`\n- `ps -ef` output\n```\n  502 17937 17590   0  6:19PM ??         7:25.31 /Users/\u003cuser\u003e/.cursor/extensions/redhat.java-1.50.0-darwin-arm64/jre/21.0.9-macosx-aarch64/bin/java --add-modules=ALL-SYSTEM --add-opens java.base/java.util=ALL-UNNAMED --add-opens java.base/java.lang=ALL-UNNAMED --add-opens java.base/sun.nio.fs=ALL-UNNAMED -Declipse.application=org.eclipse.jdt.ls.core.id1 -Dosgi.bundles.defaultStartLevel=4 -Declipse.product=org.eclipse.jdt.ls.core.product -Djava.import.generatesMetadataFilesAtProjectRoot=false -DDetectVMInstallationsJob.disabled=true -Dfile.encoding=utf8 -XX:+UseParallelGC -XX:GCTimeRatio=4 -XX:AdaptiveSizePolicyWeight=90 -Dsun.zip.disableMemoryMapping=true -Xmx2G -Xms100m -Xlog:disable -javaagent:/Users/\u003cuser\u003e/.cursor/extensions/redhat.java-1.50.0-darwin-arm64/lombok/lombok-1.18.39-4050.jar -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=/Users/\u003cuser\u003e/Library/Application Support/Cursor/User/workspaceStorage/b073665c2bc84ec3e79c32587934d14c/redhat.java -Daether.dependencyCollector.impl=bf -jar /Users/\u003cuser\u003e/.cursor/extensions/redhat.java-1.50.0-darwin-arm64/server/plugins/org.eclipse.equinox.launcher_1.7.100.v20251111-0406.jar -configuration /Users/\u003cuser\u003e/Library/Application Support/Cursor/User/globalStorage/redhat.java/1.50.0/config_mac -data /Users/\u003cuser\u003e/Library/Application Support/Cursor/User/workspaceStorage/b073665c2bc84ec3e79c32587934d14c/redhat.java/jdt_ws --pipe=/private/var/folders/cp/bcjqx5q56h7gp_3kts42xglm0000gp/T/lsp-aa7656daf3ce78c3a57214fd2e50ecf6.sock\n```\n\n**Repro / When it happens**\n- Project type: Maven/Gradle\n- Steps leading to hang: \n- Does it recover on its own? No\n\n**Observed**\n- Activity Monitor shows `java (Not Responding)` PID 17937 with low CPU\n\n**Attachments**\n- threadump of java process [17937.vscode-java-plugin.txt](https://github.com/user-attachments/files/24336246/17937.vscode-java-plugin.txt)\n- Cursor Output (Java) logs + Extension Host logs\n```\nDec 24, 2025 6:19:17 PM org.apache.aries.spifly.BaseActivator log\nINFO: Registered provider ch.qos.logback.classic.spi.LogbackServiceProvider of service org.slf4j.spi.SLF4JServiceProvider in bundle ch.qos.logback.classic\nDec 24, 2025 6:28:44 PM com.microsoft.java.debug.plugin.internal.JavaDebuggerServerPlugin start\nINFO: Starting com.microsoft.java.debug.plugin\nDec 24, 2025 6:31:26 PM org.eclipse.lsp4j.jsonrpc.RemoteEndpoint handleCancellation\nWARNING: Unmatched cancel notification for request id 214\nDec 24, 2025 6:36:01 PM org.eclipse.lsp4j.jsonrpc.RemoteEndpoint handleCancellation\nWARNING: Unmatched cancel notification for request id 977\nDec 24, 2025 6:46:24 PM org.eclipse.lsp4j.jsonrpc.RemoteEndpoint handleCancellation\nWARNING: Unmatched cancel notification for request id 2084\nDec 24, 2025 6:47:47 PM org.eclipse.lsp4j.jsonrpc.RemoteEndpoint handleCancellation\nWARNING: Unmatched cancel notification for request id 2432\nDec 24, 2025 6:52:33 PM org.eclipse.lsp4j.jsonrpc.RemoteEndpoint handleCancellation\nWARNING: Unmatched cancel notification for request id 2883\nDec 24, 2025 8:28:39 PM org.eclipse.lsp4j.jsonrpc.RemoteEndpoint handleCancellation\nWARNING: Unmatched cancel notification for request id 4289\nDec 24, 2025 8:28:39 PM org.eclipse.lsp4j.jsonrpc.RemoteEndpoint handleCancellation\nWARNING: Unmatched cancel notification for request id 4286\nDec 24, 2025 8:28:39 PM org.eclipse.lsp4j.jsonrpc.RemoteEndpoint handleCancellation\nWARNING: Unmatched cancel notification for request id 4293\nDec 25, 2025 10:32:20 AM org.eclipse.lsp4j.jsonrpc.RemoteEndpoint handleCancellation\nWARNING: Unmatched cancel notification for request id 5863\nDec 25, 2025 10:42:54 AM org.eclipse.lsp4j.jsonrpc.RemoteEndpoint handleCancellation\nWARNING: Unmatched cancel notification for request id 6305\nDec 25, 2025 10:42:54 AM org.eclipse.lsp4j.jsonrpc.RemoteEndpoint handleCancellation\nWARNING: Unmatched cancel notification for request id 6307\nDec 25, 2025 10:42:54 AM org.eclipse.lsp4j.jsonrpc.RemoteEndpoint handleCancellation\nWARNING: Unmatched cancel notification for request id 6308\nDec 25, 2025 10:42:54 AM org.eclipse.lsp4j.jsonrpc.RemoteEndpoint handleCancellation\nWARNING: Unmatched cancel notification for request id 6309\nDec 25, 2025 10:42:54 AM org.eclipse.lsp4j.jsonrpc.RemoteEndpoint handleCancellation\nWARNING: Unmatched cancel notification for request id 6310\n```","author":{"url":"https://github.com/Shawyeok","@type":"Person","name":"Shawyeok"},"datePublished":"2025-12-25T07:00:44.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":4},"url":"https://github.com/4292/vscode-java/issues/4292"}