【fix】classloaders in Sermant should not load implementations of SPI i…

…nterface from parent classloader

Signed-off-by: lilai <[email protected]>

sermant-agentcore/sermant-agentcore-core/src/main/java/io/sermant/core/plugin/classloader/ServiceClassLoader.java

@@ -20,9 +20,11 @@
 import io.sermant.core.common.CommonConstant;
 
 import java.io.File;
+import java.io.IOException;
 import java.net.MalformedURLException;
 import java.net.URL;
 import java.net.URLClassLoader;
+import java.util.Enumeration;
 import java.util.HashMap;
 import java.util.Map;
 
@@ -118,4 +120,15 @@ public URL getResource(String name) {
     public void addURL(URL url) {
         super.addURL(url);
     }
+
+    @Override
+    public Enumeration<URL> getResources(String name) throws IOException {
+        // Due to class isolation, the service loader does not obtain the service provider from the parent
+        // classloader, but returns only the resources in current classloader
+        if (name.startsWith("META-INF/services/")) {
+            return findResources(name);
+        }
+
+        return super.getResources(name);
+    }
 }