Problem:
Unable to attach JVM and getting this error in the logs
2018-04-26T17:45:26.936+02:00 | ERROR | m.instana.plugin.java.4212attach | aagentLoaderImpl | com.instana.agent - 1.1.430 | Cannot attach to JVM VirtualMachineImpl [attachType=HOTSPOT, commandLine=com.sun.javaws.Main C:\Users\Kasse\AppData\LocalLow\Sun\Java\Deployment\cache\6.0\22\48302516-3b0d9cdf, vmArgs=-Xbootclasspath/a:C:\Program Files\Java\jre1.8.0_171\lib\deploy.jar;C:\Program Files\Java\jre1.8.0_171\lib\javaws.jar;C:\Program Files\Java\jre1.8.0_171\lib\plugin.jar -Xverify:remote -Djava.security.manager -Xmx1100m -XX:+UseG1GC -Xms1100m -Djnlp.sportbet.client.servicehost=x.y.com -Djnlp.java.security.auth.login.config=http://download.y.com/ebet-clients/auth.conf -Djnlp.java.net.preferIPv4Stack=true -Djnlp.sportbet.driver.print.epson.install=true -Djava.util.Arrays.useLegacyMergeSort=true -Djnlp.tk=awt -
Solution:
It looks like the JVM may not satisfy the prerequisites of our attachment as below:
/The agent will “attach” to the JVM, which requires the tools jar to be existing in the runtime of the monitored JVM on HotSpot derivatives (Oracle, Azul, SAP and OpenJDK)./
Please verify whether the tools.jar exists within the runtime of that JVM. Alternatively, we suggest usage of a JDK which in our opinion is a better option for the execution of java applications on a server. The attached second screenshot shows where the tools JAR is located and that it is missing in the Windows JRE download from the Oracle website.
https://docs.instana.io/ecosystem/jvm/#supported-jvm-vendors-and-versions
Another possible reason for the issue might be using the G1 garbage collector (flag XX:+UseG1GC), if so please update to 1.8.0_181 or later. 1.8.0_40 fixes JVM crashes that may happen when your application has a high load and runs any other agent.
Also in some cases we need to check if the agent has administrative rights if we see below logs:
2018-04-26T13:25:26.316+02:00 | INFO | features-1-thread-1 | AgentBootstrap | com.instana.agent-bootstrap - 1.1.11 | Agent installed to C:\instana-agent and started by K-J79MB5J$
The agent needs administrative rights. Please doublecheck with customer. Thanks.
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