apache ant 无法找到或加载主类 org.apache.tools.ant.launch.Launcher

Question

I'm trying to compile a tool which uses apache ant on linux

https://github.com/lindenb/jvarkit

When I tried to compile the tool , I get n error.

$ make vcffilterjs

this is what I get when I'm running the command

echo "Compiling htsjdk with ${JAVA_HOME} = /usr/lib/jvm/java/jre/"
Compiling htsjdk with /usr/lib/jvm/java/jre/ = /usr/lib/jvm/java/jre/
echo "Compiling htsjdk library for java. Requires  apache ANT. If it fails      here, it's a not a problem with jvarkit."
Compiling htsjdk library for java. Requires  apache ANT. If it fails here,  it's a not a problem with jvarkit.
echo "And ${JAVA_HOME}/bin/javac should be >=1.7"
And /usr/lib/jvm/java/jre//bin/javac should be >=1.7
(cd /home/jannahS/jvarkit/htsjdk-1.139 && ant )
Error: Could not find or load main class  org.apache.tools.ant.launch.Launcher
make: *** [/home/jannahS/jvarkit/htsjdk-1.139/dist/htsjdk-1.139.jar] Error 1

I have installed apache ant and tried to set ANT_HOME following google instruction

export ANT_HOME=apache-ant-1.9.6
ANT_OPTS="-Xms256M -Xmx512M"
PATH=$PATH:$HOME/bin:$ANT_HOME/bin
export ANT_HOME ANT_OPTS PAT

I also have set JAVA_HOME

export JAVA_HOME=/usr/lib/jvm/jre-1.7.0
export PATH=$JAVA_HOME/jre/bin:$PATH

When I run

ant --execdebug

exec "/usr/lib/jvm/java/jre//bin/java" -Xmx256M -classpath "apache-ant-  1.9.6/lib/ant-launcher.jar" -Dant.home="apache-ant-1.9.6" -Dant.library.dir="apache-ant-1.9.6/lib" org.apache.tools.ant.launch.Launcher -cp ""
Buildfile: build.xml does not exist!
Build failed

I don't know what else to do to make things to work. I can't compile the tool that I want to use without apache ant

Answer 1

Use full path in ANT_HOME, eg:

export ANT_HOME=/usr/lib/apache-ant-1.9.6

It dependes where it is exactly located

Answer 2

Could not find or load main class org.apache.tools.ant.launch.Launcher

In mac this is due to some environment issue if you install the ant using brew command,

copy the lib folder from the ant and paste it into the bin folder

now run the command issue is resolved:-)

issue reason

ant is trying to get the bin/lib/ant-launcher.jar file from the invalid path

Answer 3

In Mac, after running brew install ant , I had to run brew link ant to fully link ant to system environment.

Running brew link --verbose --overwrite ant I get:

Linking /usr/local/Cellar/ant/1.10.5... 
ln -s ../Cellar/ant/1.10.5/bin/ant ant
ln -s ../Cellar/ant/1.10.5/bin/antRun antRun
ln -s ../Cellar/ant/1.10.5/bin/antRun.pl antRun.pl
ln -s ../Cellar/ant/1.10.5/bin/complete-ant-cmd.pl complete-ant-cmd.pl
ln -s ../Cellar/ant/1.10.5/bin/runant.pl runant.pl
ln -s ../Cellar/ant/1.10.5/bin/runant.py runant.py
6 symlinks created

And when running "ant" with no params from command-line:

Buildfile: build.xml does not exist!
Build failed

Which is what I expect if testing outside the context of an existing ant project.

Answer 4

1. Run "which ant" >> to know if the ant_home set. If not please run below with your corresponding paths to set ant_home

export ANT_HOME =/ade_autofs/gd29_3rdparty/ANT_1.7.1_GENERIC.rdd/080925/ant export PATH=/ade_autofs/gd29_3rdparty/ANT_1.7.1_GENERIC.rdd/080925/ant:${PATH}

Try ant build. It should work without any error.

Answer 5

"I agreed with full path issue for the above issue, getting the same exception while folder has access problem"

I have faced the same exception in Macbook. Checked all the configurations JAVA_HOME, ANT_HOME and org.apache.tools.ant.launch.Launcher file in Ant related jars. Finally, found the issue, due to an access problem of the apache-ant folder. I have no admin access, so I moved my setup to the desktop.

Answer 6

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$ make vcffilterjs : Compiles OK, with any of these "Linux OS´s" :

Debian 8 Jessie, CentOS 7, Fedora 23, Ubuntu 15.10, PCLinuxOS 2015.

No "ANT_HOME" or "JAVA_HOME" settings required, by using the default installed 'ant' and openjdk.

? Which "Linux OS" are you using ?

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ant jvarkit