HendSame commented on a change in pull request #6273:
URL: https://github.com/apache/skywalking/pull/6273#discussion_r566123883
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File path: docs/en/FAQ/Load-outside-jar-to-classpath.md
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@@ -0,0 +1,24 @@
+# Load outside jar to classpath
+
+### Problem
+In some cases, especially when the target java app is packaged in an old
way,that mean the depency libs directory is out of the target application jar.
We need to add some VM options to make sure the java applications starts well,
like "java -cp **/lib -ext.dirs **/lib" .
+But when we add these VM options, the target ClassLoaders may not be able to
load any classes from skywalking-agent.jar cause it's out of the path i have
defined previously. The target app classloader or any of its parent classloader
will load the class with failure and push it down to AgentClassLoader to load
the class ,and finally ,the not class found exception will stop the application
from start.
+
+### Resolve
+"-Xbootclasspath/a:" can solve this problem.
+By the way ,we can use the BootstrapClassLoader to load the them.
Review comment:
Got it. What if we can get application's codes and agent's codes to
load by application class loader. For example:
Instrumentation.**_appendToSystemClassLoaderSearch_**(application's jar or
application's dependency jar) ? Is this working?
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