Akash WM,
Even I faced the same issue on wM 8.2 designer “java service (user created) source not available (the issue is intermittent)”. Even I tried changing the permission on properties, reload, refresh etc but it did not work for me.
Workaround: Copy paste the java service in a different folder name under same package, save and unlock the java service. Later on you can rename the folder that you created in the first step.
Let me know if you have any other fix/workaround for this.
#Integration-Server-and-ESB#webMethods#Flow-and-Java-services