DSpace 5.9 Java version

[grant....@flinders.edu.au]

Hi,

I am upgrading from DSpace 5.6 Mirage2 to 5.9 Mirage2 in our test environment (from dspace-5.9-src-release.tar.gz). The following steps appear to be successful.

  $ mvn package -Dmirage2.on=true
  $ ant update

However, the following step throws an exception.

$ cd [dspace]
$ bin/dspace version
DSpace version:  5.9
  SCM revision:  ${buildNumber}
    SCM branch:  UNKNOWN_BRANCH
            OS:  Linux(amd64) version 2.6.32-754.el6.x86_64
Exception: org/postgresql/Driver : Unsupported major.minor version 52.0
java.lang.UnsupportedClassVersionError: org/postgresql/Driver : Unsupported major.minor version 52.0
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:808)
        at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
        ...

I get the same exception for other dspace commands. Eg.
  $ bin/dspace database test

My understanding is that this implies the new DSpace 5.9 PostgreSQL JDBC driver requires Java 1.8 (as it was compiled with Java 1.8) whereas the doco for DSpace 5.9 recommends using Java 1.7. Assuming this is so, I guess I should change to Java 1.8. Can I use any version of Oracle JDK or OpenJDK 1.8 with DSpace 5.x/5.9 or are some versions unsuitable? I haven't attempted to start tomcat 7 yet.

My environment is:
- RHEL 6.10; 2.6.32-754.el6.x86_64 #1 SMP
- java/javac OpenJDK 1.7.0_191
- Apache Maven 3.0.5
- Apache Ant(TM) version 1.8.4
- Apache Tomcat/7.0.65
- postgres/psql (PostgreSQL) 9.2.23 [on a remote RHEL 7.5 server]

Thank you in advance.

Cheers, Grant

[Adan]

Hi

You are using java 8 with maven, it download Postgres driver for java 8, and then deploy it in a tomcat 7.
You must use the same java version.
Or you can force the postgres driver version in the root pom.xml.
A clean package is mandatory to delete the bad downloaded driver

regards
Adán

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[Grant Jackson]

Thanks Adán.

 

Sorry, I didn't describe that very well. Please ignore the part "as it was compiled with Java 1.8".

 

I do not have Java 1.8 on the server at all. I ran maven (and ant and everything else) under Java 1.7.

 

Thanks for your idea of forcing the postgres driver version in the root pom.xml. I will consider that option if no responses re suitable versions of JDK 1.8.

 

Cheers, Grant

[Mark H. Wood]

I don't have a list of known compatible versions of JDK 1.8, but I can say that I've run DSpace on many 1.8 versions and cannot recall one that was *not* compatible.  We have several instances, from DSpace 1.8.1 to 6.2, running well on Java 1.8.0_172.

[Grant Jackson]

Great, thanks for the info Mark.

Cheers, Grant

 

From: dspac...@googlegroups.com <dspac...@googlegroups.com> On Behalf Of Mark H. Wood
Sent: Wednesday, 8 August 2018 11:32 PM
To: DSpace Technical Support <dspac...@googlegroups.com>
Subject: Re: [dspace-tech] DSpace 5.9 Java version

 

I don't have a list of known compatible versions of JDK 1.8, but I can say that I've run DSpace on many 1.8 versions and cannot recall one that was *not* compatible.  We have several instances, from DSpace 1.8.1 to 6.2, running well on Java 1.8.0_172.

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