用ant编译java源代码

Question

I have a Java source code package which is known to successfully compile. I am attempting to compile the package with ant (the build.xml file is present). When I run ant all the Java import statements generate an error message of the type:

The import java.awt.geom.Path2D cannot be resolved" (the specific message depends on what is being imported)

Clearly the package paths are not defined and I have no idea where the requested imports live in the filesystem. I assume if I know the paths that setting $CLASSPATH will get the program to compile. I am using opensuse 13.2 and my installed java info is:

java -version
openjdk version "1.8.0_45"
OpenJDK Runtime Environment (build 1.8.0_45-b14)
OpenJDK 64-Bit Server VM (build 25.45-b02, mixed mode)

Can anyone point me to where to find the java packages and how to get ant to compile the sources?

The command line used to compile sources is: ant

build.xml is in the same directory that ant is run from which also contains the src directory. This is a working project, I just don't know how to configure standard library locations (I'm not a java type by any means).

Update.

I have located the path to the openjdk libraries at /usr/lib64/jvm/java-1.8.0-openjdk-1.8.0/jre/lib/rt.jar and have tried to compile 2 different ways but still get imports cannot be resolved error messages.

Compiling with -lib option does not work:

ant -lib /usr/lib64/jvm/java-1.8.0-openjdk-1.8.0/jre/lib/rt.jar

Setting the CLASSPATH environment variable does not work:

export CLASSPATH=/usr/lib64/jvm/java-1.8.0-openjdk-1.8.0/jre/lib/rt.jar

ant

The content of build.xml is:

 <?xml version="1.0"?> <project name="MazR" default="jar" basedir="."> <property name="jar.file" value="${ant.project.name}.jar"/> <property name="src.dir" value="src"/> <property name="build.dir" value="build"/> <property name="dist.dir" value="dist"/> <property name="applet.html" value="applet.html"/> <taskdef resource="checkstyletask.properties"/> <target name="init"> <mkdir dir="${build.dir}"/> <mkdir dir="${dist.dir}"/> </target> <target name="compile" depends="init"> <javac srcdir="${src.dir}" destdir="${build.dir}" debug="on" includeantruntime="false"> <compilerarg value="-Xlint"/> </javac> </target> <target name="jar" depends="compile"> <jar destfile="${dist.dir}/${jar.file}" basedir="${build.dir}"> <manifest> <attribute name="Main-Class" value="com.nullprogram.maze.RunMaze"/> </manifest> </jar> <copy file="${applet.html}" tofile="${dist.dir}/index.html"/> </target> <target name="run" depends="jar"> <java jar="${dist.dir}/${jar.file}" fork="true"/> </target> <target name="clean"> <delete dir="${build.dir}"/> <delete file="${jar.file}"/> </target> <target name="check"> <checkstyle config="checkstyle.xml"> <fileset dir="src" includes="**/*.java"/> </checkstyle> </target> <target name="format" description="Run the indenter on all source files."> <apply executable="astyle"> <arg value="--mode=java"/> <arg value="--suffix=none"/> <fileset dir="${src.dir}" includes="**/*.java"/> </apply> </target> <target name="applet" depends="jar" description="Run the applet version."> <exec executable="appletviewer"> <arg value="${dist.dir}/index.html"/> </exec> </target> <target name="javadoc" description="Generate Javadoc HTML."> <javadoc destdir="${dist.dir}/javadoc"> <fileset dir="${src.dir}" includes="**/*.java" /> </javadoc> </target> </project> 

Any idea why import does not seem to work?

Thanks!

Further update.

I added a classpath definition to the build.xml as below, still no joy. I have not used Java in many, many years so I am way out of my depth here, help desperately appreciated.

  <property name="java.class.path" location="/usr/lib64/jvm/java-1.8.0-openjdk-1.8.0/jre/lib/rt.jar"/> <target name="compile" depends="init"> <javac srcdir="${src.dir}" destdir="${build.dir}" debug="on" includeantruntime="false"> <compilerarg value="-Xlint"/> <classpath> <pathelement path="${java.class.path}/"/> </classpath> </javac> </target> 

Answer 1

Could be that your javac and java symlinks are pointing at different places

Compare these two commands and see if they point into the roughly the same area:

which javac
which java