Oscache source code compilation cache. Java file report add (class, T) in the type eventlistenerlist is not applicable for the argu

After downloading the source code of Oscache, you need to add some functions. Compile the code after importing eclipse. The cache. Java file reports the following error:

Description resource path location type
The Method Add (class <t>, T) in the type eventlistenerlist is not applicable for the arguments (class <capture #2-? Extends cacheeventlistener>, cacheeventlistener) cache. Java oscachechgcfg/src/COM/opensymphony/Oscache/base line 360 Java Problem

Description resource path location type
The method remove (class <t>, T) in the type eventlistenerlist is not applicable for the arguments (class <capture #3-? Extends cacheeventlistener>, cacheeventlistener) cache. Java oscachechgcfg/src/COM/opensymphony/Oscache/base line 673 Java Problem

I checked the document on Oscache and found no problem.
The JDK version is suspected to be a problem. The machine uses JDK 1.6 by default. After switching to JDK, the problem persists.
Jdk1.4 is required? The problem is caused by the new features of JDK. So I found jdk1.4 and switched it over to compile it. Everything is OK!