Build failed in Jenkins: Pivot-trunk on Java 7 #1215

[Apache Jenkins Server]

See 
<https://builds.apache.org/job/Pivot-trunk%20on%20Java%207/1215/display/redirect?page=changes>

Changes:

[rwhitcomb] Add a convenience method to TreeView to expand all the parents of a 
particular
path so that the node at the path is fully exposed.  I needed this in our
application, and it seemed both useful and easy to implement.
Method is "expandToBranch(Path)".

------------------------------------------
Started by an SCM change
[EnvInject] - Loading node environment variables.
Building remotely on ubuntu-6 (ubuntu trusty) in workspace 
<https://builds.apache.org/job/Pivot-trunk%20on%20Java%207/ws/>
Reverting <https://builds.apache.org/job/Pivot-trunk%20on%20Java%207/ws/.> to 
depth infinity with ignoreExternals: false
Updating http://svn.apache.org/repos/asf/pivot/jenkins at revision 
'2017-04-12T22:37:11.195 +0000'
At revision 1791192

Reverting 
<https://builds.apache.org/job/Pivot-trunk%20on%20Java%207/ws/pivot_trunk> to 
depth infinity with ignoreExternals: false
Updating http://svn.apache.org/repos/asf/pivot/trunk at revision 
'2017-04-12T22:37:11.195 +0000'
U         wtk/src/org/apache/pivot/wtk/TreeView.java
At revision 1791192

No changes for http://svn.apache.org/repos/asf/pivot/jenkins since the previous 
build
[EnvInject] - Executing scripts and injecting environment variables after the 
SCM step.
[Pivot-trunk on Java 7] $ /home/jenkins/tools/ant/latest/bin/ant check clean 
package test doc deploy package-tests package-sources package-javadoc
Exception in thread "main" java.lang.UnsupportedClassVersionError: 
org/apache/tools/ant/launch/Launcher : 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 sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:482)
Build step 'Invoke Ant' marked build as failure