Exception in thread “main” java.lang.NoClassDefFoundError

Question

I am getting an exception exception when attempting to run a Java sample application.

Below is a stack trace from the console:

    $./init-og-examples-db.sh
        Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/tools/ant/Task
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:792)
    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$1.run(URLClassLoader.java:355)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:482)
Caused by: java.lang.ClassNotFoundException: org.apache.tools.ant.Task
    at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    ... 13 more
Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/tools/ant/Task
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:792)
    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$1.run(URLClassLoader.java:355)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:482)
Caused by: java.lang.ClassNotFoundException: org.apache.tools.ant.Task
    at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    ... 13 more
### Adding example data
Error: Could not find or load main class com.opengamma.examples.tool.ExampleDatabasePopulator
### Completed

I am relatively new to Java, so I am not sure why the class is not been found, since the class does exist:

someone@yourbox:~/work/dev/java/OG-Platform/projects/OG-Examples/scripts$ find ../../.. -type f -name 'ExampleDatabasePopulator.*'
../../../projects/OG-Examples/bin/com/opengamma/examples/tool/ExampleDatabasePopulator.class
../../../projects/OG-Examples/build/classes/com/opengamma/examples/tool/ExampleDatabasePopulator.class
../../../projects/OG-Examples/src/main/java/com/opengamma/examples/tool/ExampleDatabasePopulator.java
../../../projects/OG-BloombergExample/bin/com/opengamma/bloombergexample/tool/ExampleDatabasePopulator.class
../../../projects/OG-BloombergExample/build/classes/com/opengamma/bloombergexample/tool/ExampleDatabasePopulator.class
../../../projects/OG-BloombergExample/src/main/java/com/opengamma/bloombergexample/tool/ExampleDatabasePopulator.java

Can anyone help me fix this?

[Update]

I have done the following:

1. Removed and manually installed ant on my machine

2. Searched for .jar files containing the word Task (in an attempt to find the file that implements the Task class)

grep -lri Task --include=*.jar /usr/local/apache-ant-1.9.1
/usr/local/apache-ant-1.9.1/lib/ant-netrexx.jar
/usr/local/apache-ant-1.9.1/lib/ant-jdepend.jar
/usr/local/apache-ant-1.9.1/lib/ant-javamail.jar
/usr/local/apache-ant-1.9.1/lib/ant-junit.jar
/usr/local/apache-ant-1.9.1/lib/ant-jsch.jar
/usr/local/apache-ant-1.9.1/lib/ant-apache-xalan2.jar
/usr/local/apache-ant-1.9.1/lib/ant-junit4.jar
/usr/local/apache-ant-1.9.1/lib/ant-jmf.jar
/usr/local/apache-ant-1.9.1/lib/ant.jar
/usr/local/apache-ant-1.9.1/lib/ant-testutil.jar
/usr/local/apache-ant-1.9.1/lib/ant-jai.jar
/usr/local/apache-ant-1.9.1/lib/ant-commons-net.jar
/usr/local/apache-ant-1.9.1/lib/ant-antlr.jar
/usr/local/apache-ant-1.9.1/lib/ant-swing.jar

3. Added the relevant folders to my CLASSPATH

export CLASSPATH=$CLASSPATH:/usr/local/apache-ant-1.9.1/etc:/usr/local/apache-ant-1.9.1/lib

4. Made sure that I have both JAVA_HOME and ANT_HOME set correctly

echo $ANT_HOME
/usr/local/apache-ant-1.9.1
echo $JAVA_HOME
/usr/lib/jvm/java-7-oracle/jre

Still, I get exactly the same errors as before (ie stack trace is same as that above).

[2nd Update]

This is the contents of the script file I am running:

#!/bin/sh

if [ ! -z "$JAVA_HOME" ]; then
  JAVA=$JAVA_HOME/bin/java
elif [ -x /opt/jdk1.6.0_16/bin/java ]; then
  JAVA=/opt/jdk1.6.0_16/bin/java
else
  # No JAVA_HOME, try to find java in the path
  JAVA=`which java 2>/dev/null`
  if [ ! -x "$JAVA" ]; then
    # No java executable in the path either
    echo "Error: Cannot find a JRE or JDK. Please set JAVA_HOME"
    exit 1
  fi
fi

if [ "`basename $0`" = "init-og-examples-db.sh" ] ; then
  cd `dirname $0`/.. #PLAT-1527
fi

CLASSPATH=config:og-examples.jar
for FILE in `ls -1 lib/*` ; do
  CLASSPATH=$CLASSPATH:$FILE
done

echo "### Creating empty database"

$JAVA  -cp "$CLASSPATH" \
  -Dlogback.configurationFile=jetty-logback.xml \
  com.opengamma.util.test.DbTool \
  -jdbcUrl jdbc:hsqldb:file:install/db/hsqldb/example-db \
  -database og-financial \
  -user "OpenGamma" \
  -password "OpenGamma" \
  -drop true \
  -create true \
  -createtables true \
  -dbscriptbasedir .

$JAVA  -cp "$CLASSPATH" \
  -Dlogback.configurationFile=jetty-logback.xml \
  com.opengamma.util.test.DbTool \
  -jdbcUrl jdbc:hsqldb:file:temp/hsqldb/og-fin-user \
  -database og-financial \
  -user "OpenGamma" \
  -password "OpenGamma" \
  -drop true \
  -create true \
  -createtables true \
  -dbscriptbasedir .

echo "### Adding example data"

$JAVA  -cp "$CLASSPATH" \
  -Xms512M \
  -Xmx1024M \
  -Dlogback.configurationFile=jetty-logback.xml \
  com.opengamma.examples.tool.ExampleDatabasePopulator

echo "### Completed"

Answer 1

Please note that your CLASSPATH is not valid for your execution. Your CLASSPATH must be

export CLASSPATH=$CLASSPATH:/usr/local/apache-ant-1.9.1/etc:/usr/local/apache-ant-1.9.1/lib/ant-netrexx.jar:/usr/local/apache-ant-1.9.1/lib/ant-jdepend.jar:/usr/local/apache-ant-1.9.1/lib/ant-javamail.jar:/usr/local/apache-ant-1.9.1/lib/ant-junit.jar:/usr/local/apache-ant-1.9.1/lib/ant-jsch.jar:/usr/local/apache-ant-1.9.1/lib/ant-apache-xalan2.jar:/usr/local/apache-ant-1.9.1/lib/ant-junit4.jar:/usr/local/apache-ant-1.9.1/lib/ant-jmf.jar:/usr/local/apache-ant-1.9.1/lib/ant.jar:/usr/local/apache-ant-1.9.1/lib/ant-testutil.jar:/usr/local/apache-ant-1.9.1/lib/ant-jai.jar:/usr/local/apache-ant-1.9.1/lib/ant-commons-net.jar:/usr/local/apache-ant-1.9.1/lib/ant-antlr.jar:/usr/local/apache-ant-1.9.1/lib/ant-swing.jar

If you name only a directory only the .class files from the directory will be included.

.jar files must be named explicitly in the CLASSPATH as they are not included automatically.

Answer 2

The ant jars seem to be missing. You can download them from here and them to the classpath.

Answer 3

In some cases works by adding a :. at the end. For example:

export CLASSPATH=$CLASSPATH:/usr/local/apache-ant-1.9.1/etc:/usr/local/apache-ant-1.9.1/lib/ant-netrexx.jar:.