Build failed

[fanyigle]

Hello,instructor.
I followed the step on Ubuntu 18,with ant 1.10.5 and junit installed.
here is the output of " ls /usr/share/ant/lib"

ant-antlr.jar ant-commons-logging.jar ant-launcher.jar
ant-apache-bcel.jar ant-commons-net.jar ant-swing.jar
ant-apache-bsf.jar ant-javamail.jar ant-testutil.jar
ant-apache-log4j.jar ant-jdepend.jar ant-xz.jar
ant-apache-oro.jar ant-jmf.jar ant.jar
ant-apache-regexp.jar ant-jsch.jar junit.jar
ant-apache-resolver.jar ant-junit.jar
ant-apache-xalan2.jar ant-junit4.jar

But when I try to build ,it failed.Plz help troubleshoot,thanks. (following is the console output)
15:55:29 Started by user SF
15:55:29 Running as SYSTEM
15:55:29 Building in workspace /var/lib/jenkins/workspace/anttest/InAnt
15:55:29 No credentials specified
15:55:29 > git rev-parse --is-inside-work-tree # timeout=10
15:55:29 Fetching changes from the remote Git repository
15:55:29 > git config remote.origin.url https://github.com/darealmc/some_java.git # timeout=10
15:55:29 Fetching upstream changes from https://github.com/darealmc/some_java.git
15:55:29 > git --version # timeout=10
15:55:29 > git fetch --tags --progress -- https://github.com/darealmc/some_java.git +refs/heads/:refs/remotes/origin/ # timeout=10
15:55:31 > git rev-parse refs/remotes/origin/master^{commit} # timeout=10
15:55:31 > git rev-parse refs/remotes/origin/origin/master^{commit} # timeout=10
15:55:31 Checking out Revision 72e7208 (refs/remotes/origin/master)
15:55:31 > git config core.sparsecheckout # timeout=10
15:55:31 > git checkout -f 72e7208 # timeout=10
15:55:31 Commit message: "workkng the test method"
15:55:31 > git rev-list --no-walk 72e7208 # timeout=10
15:55:31 [InAnt] $ /usr/share/ant/bin/ant junit
15:55:33 Buildfile: /var/lib/jenkins/workspace/anttest/InAnt/build.xml
15:55:34
15:55:34 tcomp:
15:55:34 [javac] /var/lib/jenkins/workspace/anttest/InAnt/build.xml:13: warning: 'includeantruntime' was not set, defaulting to build.sysclasspath=last; set to false for repeatable builds
15:55:34 [javac] Compiling 1 source file to /var/lib/jenkins/workspace/anttest/InAnt/test
15:55:35 [javac] /var/lib/jenkins/workspace/anttest/InAnt/test/hellotest.java:15: error: ';' expected
15:55:35 [javac] string second="one"
15:55:35 [javac] ^
15:55:35 [javac] 1 error
15:55:35
15:55:35 BUILD FAILED
15:55:35 /var/lib/jenkins/workspace/anttest/InAnt/build.xml:13: Compile failed; see the compiler error output for details.
15:55:35
15:55:35 Total time: 2 seconds
15:55:35 Build step 'Invoke Ant' marked build as failure
15:55:35 Recording test results
15:55:35 Finished: FAILURE

[branko77]

Same thing over here