Add property to disallow self-attachment to avoid linking a file into…

… the system class loader that is supposed to be deleted.

byte-buddy-agent/src/main/java/net/bytebuddy/agent/ByteBuddyAgent.java

@@ -59,6 +59,11 @@
  */
 public class ByteBuddyAgent {
 
+    /**
+     * Indicates that the agent should not resolve it's own code location for a self-attachment.
+     */
+    public static final String LATENT_RESOLVE = "net.bytebuddy.agent.latent";
+
     /**
      * The manifest property specifying the agent class.
      */
@@ -686,6 +691,9 @@ private static void installExternal(AttachmentProvider.Accessor.ExternalAttachme
     @SuppressFBWarnings(value = "REC_CATCH_EXCEPTION", justification = "Exception should not be rethrown but trigger a fallback")
     private static File trySelfResolve() {
         try {
+            if (Boolean.getBoolean(LATENT_RESOLVE)) {
+                return CANNOT_SELF_RESOLVE;
+            }
             ProtectionDomain protectionDomain = Attacher.class.getProtectionDomain();
             if (protectionDomain == null) {
                 return CANNOT_SELF_RESOLVE;
@@ -1397,6 +1405,9 @@ enum ForByteBuddyAgent implements AgentProvider {
              */
             private static File trySelfResolve() throws IOException {
                 ProtectionDomain protectionDomain = Installer.class.getProtectionDomain();
+                if (Boolean.getBoolean(LATENT_RESOLVE)) {
+                    return CANNOT_SELF_RESOLVE;
+                }
                 if (protectionDomain == null) {
                     return CANNOT_SELF_RESOLVE;
                 }