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https://issues.apache.org/jira/browse/FLINK-6843?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16065709#comment-16065709
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mingleizhang commented on FLINK-6843:
-------------------------------------
[~aljoscha] I guess caused this because of java version mismatch. And J2SE 8
belongs to 52. The error message to
{code:java}
Unsupported major.minor version 52.0
{code}
is because during compile time using a higher JDK and a lower JDK during
runtime here is jdk7 belongs to 51. I dont know how Travis works, it might be
travis compile the source code on a machine which use JDK8 and run .class file
on a jdk7 machine.
> ClientConnectionTest fails on travis
> ------------------------------------
>
> Key: FLINK-6843
> URL: https://issues.apache.org/jira/browse/FLINK-6843
> Project: Flink
> Issue Type: Bug
> Components: Tests
> Affects Versions: 1.3.0
> Reporter: Chesnay Schepler
> Priority: Blocker
> Fix For: 1.3.2
>
>
> jdk7, hadoop 2.4.1, scala 2.11
> {code}
> testJobManagerRetrievalWithHAServices(org.apache.flink.client.program.ClientConnectionTest)
> Time elapsed: 0.013 sec <<< ERROR!
> java.lang.UnsupportedClassVersionError:
> org/apache/flink/runtime/highavailability/TestingHighAvailabilityServices :
> Unsupported major.minor version 52.0
> at java.lang.ClassLoader.defineClass1(Native Method)
> at java.lang.ClassLoader.defineClass(ClassLoader.java:800)
> at
> java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
> at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
> at java.net.URLClassLoader.access$100(URLClassLoader.java:71)
> at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
> at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
> at java.security.AccessController.doPrivileged(Native Method)
> at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
> at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
> at
> org.apache.flink.client.program.ClientConnectionTest.testJobManagerRetrievalWithHAServices(ClientConnectionTest.java:122)
> {code}
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