HendSame edited a comment on issue #3661:
URL: https://github.com/apache/skywalking/issues/3661#issuecomment-768278507
I have a question:
Do you have to load the depency libs by "ExtClassLoader"? @jackiepon31
"-Xbootclasspath/a:" can not solve this problem？By the way ,we can use
the BootstrapClassLoader to load the them.
We can run the oldWay.jar such as:
```
java -javaagent:/{skywalking-agent-dir}/skywalking-agent-abm.jar
-Xbootclasspath/a:/{your}.jar
-Dskywalking.agent.service_name=serverName
-Dskywalking.collector.backend_service=127.0.0.1:11800
Maybe multiple jar in one directory:
java -javaagent:/{skywalking-agent-dir}/skywalking-agent-abm.jar
-Xbootclasspath/a:/{jar-directory}
-Dskywalking.agent.service_name=serverName
-Dskywalking.collector.backend_service=127.0.0.1:11800
```
If don't want to do that like the above
Just like @jackiepon31 said：
“I suggest to add SkyWalking-agent.jar or its dirs to classpath to make the
load mechanism compatible with old packaing way instead of spring-boot fat
jar.” by using the BootstrapClassLoader to load the them, rather than the
ExtClassLoader ,is OK? @wu-sheng .Because ExtClassLoader can't seem to do it。
We can use "instrumentation.appendToBootstrapClassLoaderSearch(jarFile)":
```
public class SkyWalkingAgent {
private static ILog LOGGER =
LogManager.getLogger(SkyWalkingAgent.class);
public static void premain(String agentArgs, Instrumentation
instrumentation) throws PluginException {
File basePath = AgentPackagePath.getPath();
File classPathDictionary = new File(basePath, "classpath");
if (classPathDictionary.exists() &&
classPathDictionary.isDirectory()) {
String[] jarFileNames = classPathDictionary.list((dir,
name) -> name.endsWith(".jar"));
for (String fileName : jarFileNames) {
JarFile jarFile = new JarFile(classPathDictionary +
"/" + fileName);
instrumentation.appendToBootstrapClassLoaderSearch(jarFile);
}
}
//.......
}
```
"classpath" is a dictionary that has the jars which need to load to
classpath;
```
skywalking
-- classpath
-- 1.jar
-- 2.jar
-- skywalking-agent-abm.jar
```
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