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Standalone JVM

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Attaching the OverOps Agent to a JVM Running Java 10,11 or 16

When attaching an OverOps Agent to a JVM that is running Java 10, 11 or 16 or any IBM java versions, follow these guidelines:

  1. Turn off Class Sharing: This can be done using the following flags:
    for IBM Java
    ‑Xshareclasses:none
    for HotSpot
    -Xshare:off -XX:-UseTypeSpeculation

  2. Increase ReservedCodeCache to at least 512mb by adding the following flag
    -XX:ReservedCodeCacheSize=512m

  3. The Agent should appear last in the VM arguments list before specifying the main class or jar.

  4. When adding/removing 3rd party packages, the Agent should be restarted.

Additionally, if you wish to upgrade your own compiler to target Java 10/11, then you'll have to upgrade your Collector (SaaS) or Collector + backend (On-Premises) to support it.

Connecting the OverOps Agent

To connect OverOps to your application, add the following argument to your JVM startup arguments:

-agentlib:TakipiAgent

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Rootless Agent Installation Method (Linux only)

When Using the Rootless Agent Installation Method replace the
-agentlib:TakipiAgent JVM startup Argument
with
-agentpath:<TAKIPI_HOME>/lib/libTakipiAgent.so JVM startup Argument

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Important: -agentlib is a JVM argument and has to be written before -jar / -cp arguments. For example:
java -Xmx2G -agentlib:TakipiAgent -jar myapp.jar
or respectively
java -Xmx2G -agentpath:<TAKIPI_HOME>/lib/libTakipiAgent.so -jar myappjar

Using Maven

In the terminal / command line, add -agentlib:TakipiAgent to the MAVEN_OPTS environment variable:

Linux / macOS:

export MAVEN_OPTS="$MAVEN_OPTS -agentlib:TakipiAgent"

Windows:

set MAVEN_OPTS=%MAVEN_OPTS% -agentlib:TakipiAgent