Running Oracle 11g and SQL Developer Version 3.2.09 on Linux.
When tried to compile the PACKAGE PKG_test, the console displayed:
PACKAGE PKG_test compiled
Errors: check compiler log
Where is the compiler log saved?
The sql developer is installed at /opt/sqldeveloper/sqldeveloper
Should be docked below your editor with the other logs/panels
You'll get 'better' support in the PLSQL Editor vs the Worksheet.
Here's a few screenshots of the Compiler Log