[Dspace-tech] Could not find the main class: org.dspace.storage.rdbms.DatabaseUtils. Program will exit.

[Vimal Kumar V.]

Dear Friends,

I got following error in the final step of Dspace installation.

You got such errors before?
root@user1:/build/dspace-5.1-src-release/dspace/target/dspace-installer# sudo ant fresh_install

Unable to locate tools.jar. Expected to find it in /usr/lib/jvm/java-6-openjdk-amd64/lib/tools.jar
Buildfile: /build/dspace-5.1-src-release/dspace/target/dspace-installer/build.xml

init_installation:

init_configs:
     [copy] Copying 41 files to /dspace/config
     [copy] Copying 1 file to /dspace/config

test_database:
     [java] Exception in thread "main" java.lang.UnsupportedClassVersionError: org/dspace/storage/rdbms/DatabaseUtils : Unsupported major.minor version 51.0
     [java]     at java.lang.ClassLoader.defineClass1(Native Method)
     [java]     at java.lang.ClassLoader.defineClass(ClassLoader.java:643)
     [java]     at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
     [java]     at java.net.URLClassLoader.defineClass(URLClassLoader.java:277)
     [java]     at java.net.URLClassLoader.access$000(URLClassLoader.java:73)
     [java]     at java.net.URLClassLoader$1.run(URLClassLoader.java:212)
     [java]     at java.security.AccessController.doPrivileged(Native Method)
     [java]     at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
     [java]     at java.lang.ClassLoader.loadClass(ClassLoader.java:323)
     [java]     at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
     [java]     at java.lang.ClassLoader.loadClass(ClassLoader.java:268)
     [java] Could not find the main class: org.dspace.storage.rdbms.DatabaseUtils. Program will exit.

BUILD FAILED
/build/dspace-5.1-src-release/dspace/target/dspace-installer/build.xml:797: Java returned: 1

Total time: 4 seconds

Your help is essential to overcome this error.

Regards,

--

Vimal Kumar V.
Technical Assistant
Mahatma Gandhi University Library
Kottayam, Kerala- 686 560
Web: http://www.vimalkumar.info
Blog: http://linuxhalwa.blogspot.com http://kohageek.blogspot.in http://moovandan.blogspot.in
---------------------------------------------------------------------------
"I forget what I was taught. I only remember what I have learnt"
-Patrick White

[Andrea Schweer]

Hi,

On 16/05/15 05:07, Vimal Kumar V. wrote:
> Dear Friends,
> I got following error in the final step of Dspace installation.
> You got such errors before?
> root@user1:/build/dspace-5.1-src-release/dspace/target/dspace-installer#
> sudo ant fresh_install
>
> Unable to locate tools.jar. Expected to find it in
> /usr/lib/jvm/java-6-openjdk-amd64/lib/tools.jar
> Buildfile:
> /build/dspace-5.1-src-release/dspace/target/dspace-installer/build.xml
>
> init_installation:
>
> init_configs:
> [copy] Copying 41 files to /dspace/config
> [copy] Copying 1 file to /dspace/config
>
> test_database:
> [java] Exception in thread "main"
> java.lang.UnsupportedClassVersionError:
> org/dspace/storage/rdbms/DatabaseUtils : Unsupported major.minor
> version 51.0

That looks to me like you are running a JRE, not a JDK, and of a too old
Java version. DSpace 5.x needs a JDK of Java 7 or newer:
https://wiki.duraspace.org/display/DSDOC5x/Installing+DSpace#InstallingDSpace-OracleJavaJDK7orOpenJDK7

cheers,
Andrae

--
Dr Andrea Schweer
IRR Technical Specialist, ITS Information Systems
The University of Waikato, Hamilton, New Zealand