Illegal onEvent method - ProGuard

I am receiving this error:

Illegal onEvent method, check for typos

The error appears to be caused by a method name changing in my compile process by ProGuard. Here is a sample of the log I created to test:

methodName=onEvent modifierString= methodName=onEvent$3884d48a modifierString=$3884d48a skipMethodVerificationForClasses={}

The solution is to check for the $ character at the start of the modifierString.

This diff solves the issue:

@@ -91,7 +91,7 @@ class SubscriberMethodFinder {
                             } else if (modifierString.equals("Async")) {
                                 threadMode = ThreadMode.Async;
                             } else {
-                                if (skipMethodVerificationForClasses.containsKey(clazz)) {
+                                if (skipMethodVerificationForClasses.containsKey(clazz) || modifierString.startsWith("$")) {
                                     continue;
                                 } else {
                                     throw new EventBusException("Illegal onEvent method, check for typos: " + method);

[sdeff]

I had an similar issue and I contacted the creator of ProGuard/DexGuard and he sent me a ‘workaround’ for this.

Just add: -keepclassmembers,includedescriptorclasses class ** { public void onEvent*(**); }

To your config file to prevent ProGuard/DexGuard’s optimization step to add a suffix to the method name.

[cs-victor-nascimento]

Stumbled upon this recently. This should be in the wiki of the project.