Question

When I try to compile commons-dbcp-1.2.2 with JDK6/7 I get this error:

org.apache.commons.dbcp.BasicDataSource is not abstract and does not override abstract method isWrapperFor(java.lang.Class) in java.sql.Wrapper

This is because commons-dbcp-1.2.2 was written before JDK6, at a time where java.sql.Wrapper did not have an isWrapperFor method.

So I installed JDK5, but I get such messages (probably because of all the Java7-compiled JARs):

java.lang.UnsupportedClassVersionError: Bad version number in .class file

How to solve this problem?

Answer 1

I finally managed to compile commons-dbcp-1.2.2 and here is how I did:

1. Download revision 558600 (because someone wrote the right patch for it. It is pretty much 1.2.2 with a few fixes)

   svn checkout -r 558600 http://svn.apache.org/repos/asf/commons/proper/dbcp/trunk commons-dbcp
   

2. Download this patch (explanation of the patch) and patch:

   wget https://issues.apache.org/jira/secure/attachment/12362389/patch.txt
   patch -p0 <patch.txt
   

Copy build.properties.sample to build.properties, download the jars described in the file, and change to appropriate paths.

Build with OpenJDK 7.