Analyse following RPM build log snippet. Describe contents accurately, without speculation or suggestions for resolution.            
Your analysis must be as concise as possible, while keeping relevant information intact.
Snippet: 
[ERROR] org.postgresql.test.jdbc2.MixedParameterMultiStatementTest.regularMultiStatement  Time elapsed: 0.001 s  <<< ERROR!
java.lang.NullPointerException: Cannot invoke "java.sql.Connection.unwrap(java.lang.Class)" because "this.con" is null
Multiple tests have experienced errors. This was caused by 'this.con' being null.