Eclipse How to build an executable jar with external jar

Question

I am trying to build an executable jar program which depends on external jar downloaded  In my project  I included them in the build path and can be run and debug within eclipse   When I tried to export it to a jar  I can run the program but I can t when I try to press a button which includes function calls and classes from the external jar  I have edited the environment variables  Windows XP  CLASSPATH to include paths of all the external jar  but it doesn t work   A point to note is that I got compile warnings while exporting my executable jar  but it doesn t show up any description about the warnings   Would someone kindly provide a thorough guide on how to include an external jar program using eclipse

User · Answer

As a good practice you can use an Ant Script (Eclipse comes with it) to generate your JAR file. Inside this JAR you can have all dependent libs.

You can even set the MANIFEST's Class-path header to point to files in your filesystem, it's not a good practice though.

Ant build.xml script example:

<project name="jar with libs" default="compile and build" basedir=".">
<!-- this is used at compile time -->
<path id="example-classpath">
    <pathelement location="${root-dir}" />
    <fileset dir="D:/LIC/xalan-j_2_7_1" includes="*.jar" />
</path>

<target name="compile and build">
    <!-- deletes previously created jar -->
    <delete file="test.jar" />

    <!-- compile your code and drop .class into "bin" directory -->
    <javac srcdir="${basedir}" destdir="bin" debug="true" deprecation="on">
        <!-- this is telling the compiler where are the dependencies -->
        <classpath refid="example-classpath" />
    </javac>

    <!-- copy the JARs that you need to "bin" directory  -->
    <copy todir="bin">
        <fileset dir="D:/LIC/xalan-j_2_7_1" includes="*.jar" />
    </copy>

    <!-- creates your jar with the contents inside "bin" (now with your .class and .jar dependencies) -->
    <jar destfile="test.jar" basedir="bin" duplicate="preserve">
        <manifest>
            <!-- Who is building this jar? -->
            <attribute name="Built-By" value="${user.name}" />
            <!-- Information about the program itself -->
            <attribute name="Implementation-Vendor" value="ACME inc." />
            <attribute name="Implementation-Title" value="GreatProduct" />
            <attribute name="Implementation-Version" value="1.0.0beta2" />
            <!-- this tells which class should run when executing your jar -->
            <attribute name="Main-class" value="ApplyXPath" />
        </manifest>
    </jar>
</target>

User · Answer

Try the fat-jar extension  It will include all external jars inside the jar    Update url  http   kurucz-grafika de fatjar Homepage  http   fjep sourceforge net

User · Answer

As a good practice you can use an Ant Script (Eclipse comes with it) to generate your JAR file. Inside this JAR you can have all dependent libs.

You can even set the MANIFEST's Class-path header to point to files in your filesystem, it's not a good practice though.

Ant build.xml script example:

<project name="jar with libs" default="compile and build" basedir=".">
<!-- this is used at compile time -->
<path id="example-classpath">
    <pathelement location="${root-dir}" />
    <fileset dir="D:/LIC/xalan-j_2_7_1" includes="*.jar" />
</path>

<target name="compile and build">
    <!-- deletes previously created jar -->
    <delete file="test.jar" />

    <!-- compile your code and drop .class into "bin" directory -->
    <javac srcdir="${basedir}" destdir="bin" debug="true" deprecation="on">
        <!-- this is telling the compiler where are the dependencies -->
        <classpath refid="example-classpath" />
    </javac>

    <!-- copy the JARs that you need to "bin" directory  -->
    <copy todir="bin">
        <fileset dir="D:/LIC/xalan-j_2_7_1" includes="*.jar" />
    </copy>

    <!-- creates your jar with the contents inside "bin" (now with your .class and .jar dependencies) -->
    <jar destfile="test.jar" basedir="bin" duplicate="preserve">
        <manifest>
            <!-- Who is building this jar? -->
            <attribute name="Built-By" value="${user.name}" />
            <!-- Information about the program itself -->
            <attribute name="Implementation-Vendor" value="ACME inc." />
            <attribute name="Implementation-Title" value="GreatProduct" />
            <attribute name="Implementation-Version" value="1.0.0beta2" />
            <!-- this tells which class should run when executing your jar -->
            <attribute name="Main-class" value="ApplyXPath" />
        </manifest>
    </jar>
</target>

User · Answer

As a good practice you can use an Ant Script (Eclipse comes with it) to generate your JAR file. Inside this JAR you can have all dependent libs.

You can even set the MANIFEST's Class-path header to point to files in your filesystem, it's not a good practice though.

Ant build.xml script example:

<project name="jar with libs" default="compile and build" basedir=".">
<!-- this is used at compile time -->
<path id="example-classpath">
    <pathelement location="${root-dir}" />
    <fileset dir="D:/LIC/xalan-j_2_7_1" includes="*.jar" />
</path>

<target name="compile and build">
    <!-- deletes previously created jar -->
    <delete file="test.jar" />

    <!-- compile your code and drop .class into "bin" directory -->
    <javac srcdir="${basedir}" destdir="bin" debug="true" deprecation="on">
        <!-- this is telling the compiler where are the dependencies -->
        <classpath refid="example-classpath" />
    </javac>

    <!-- copy the JARs that you need to "bin" directory  -->
    <copy todir="bin">
        <fileset dir="D:/LIC/xalan-j_2_7_1" includes="*.jar" />
    </copy>

    <!-- creates your jar with the contents inside "bin" (now with your .class and .jar dependencies) -->
    <jar destfile="test.jar" basedir="bin" duplicate="preserve">
        <manifest>
            <!-- Who is building this jar? -->
            <attribute name="Built-By" value="${user.name}" />
            <!-- Information about the program itself -->
            <attribute name="Implementation-Vendor" value="ACME inc." />
            <attribute name="Implementation-Title" value="GreatProduct" />
            <attribute name="Implementation-Version" value="1.0.0beta2" />
            <!-- this tells which class should run when executing your jar -->
            <attribute name="Main-class" value="ApplyXPath" />
        </manifest>
    </jar>
</target>

User · Answer

You can do this by writing a manifest for your jar  Have a look at the Class-Path header  Eclipse has an option for choosing your own manifest on export   The alternative is to add the dependency to the classpath at the time you invoke the application   win32  java exe -cp app jar dependency jar foo MyMainClass  nix   java -cp app jar dependency jar foo MyMainClass

User · Answer

You can do this by writing a manifest for your jar  Have a look at the Class-Path header  Eclipse has an option for choosing your own manifest on export   The alternative is to add the dependency to the classpath at the time you invoke the application   win32  java exe -cp app jar dependency jar foo MyMainClass  nix   java -cp app jar dependency jar foo MyMainClass

User · Answer

Try the fat-jar extension  It will include all external jars inside the jar    Update url  http   kurucz-grafika de fatjar Homepage  http   fjep sourceforge net

User · Answer

Eclipse 3 5 has an option to package required libraries into the runnable jar  File -  Export    Choose runnable jar and click next  The runnable jar export window has a radio button where you can choose to package the required libraries into the jar

User · Answer

look   java-jar-ignores-classpath-Workaround

User · Answer

As a good practice you can use an Ant Script (Eclipse comes with it) to generate your JAR file. Inside this JAR you can have all dependent libs.

You can even set the MANIFEST's Class-path header to point to files in your filesystem, it's not a good practice though.

Ant build.xml script example:

<project name="jar with libs" default="compile and build" basedir=".">
<!-- this is used at compile time -->
<path id="example-classpath">
    <pathelement location="${root-dir}" />
    <fileset dir="D:/LIC/xalan-j_2_7_1" includes="*.jar" />
</path>

<target name="compile and build">
    <!-- deletes previously created jar -->
    <delete file="test.jar" />

    <!-- compile your code and drop .class into "bin" directory -->
    <javac srcdir="${basedir}" destdir="bin" debug="true" deprecation="on">
        <!-- this is telling the compiler where are the dependencies -->
        <classpath refid="example-classpath" />
    </javac>

    <!-- copy the JARs that you need to "bin" directory  -->
    <copy todir="bin">
        <fileset dir="D:/LIC/xalan-j_2_7_1" includes="*.jar" />
    </copy>

    <!-- creates your jar with the contents inside "bin" (now with your .class and .jar dependencies) -->
    <jar destfile="test.jar" basedir="bin" duplicate="preserve">
        <manifest>
            <!-- Who is building this jar? -->
            <attribute name="Built-By" value="${user.name}" />
            <!-- Information about the program itself -->
            <attribute name="Implementation-Vendor" value="ACME inc." />
            <attribute name="Implementation-Title" value="GreatProduct" />
            <attribute name="Implementation-Version" value="1.0.0beta2" />
            <!-- this tells which class should run when executing your jar -->
            <attribute name="Main-class" value="ApplyXPath" />
        </manifest>
    </jar>
</target>

User · Answer

Try the fat-jar extension  It will include all external jars inside the jar    Update url  http   kurucz-grafika de fatjar Homepage  http   fjep sourceforge net

User · Answer

Try the fat-jar extension  It will include all external jars inside the jar    Update url  http   kurucz-grafika de fatjar Homepage  http   fjep sourceforge net

User · Answer

look   java-jar-ignores-classpath-Workaround

User · Answer

How to include the jars of your project into your runnable jar  I m using Eclipse Version  3 7 2 running on Ubuntu 12 10   I ll also show you how to make the build xml so you can do the ant jar from command line and create your jar with other imported jars extracted into it  Basically you ask Eclipse to construct the build xml that imports your libraries into your jar for you   Fire up Eclipse and make a new Java project  make a new package  mypackage   add your main class  Runner  Put this code in there    Now include the mysql-connector-java-5 1 28-bin jar from Oracle which enables us to write Java to connect to the MySQL database   Do this by right clicking the project - gt  properties - gt  java build path - gt  Add External Jar - gt  pick mysql-connector-java-5 1 28-bin jar   Run the program within eclipse  it should run  and tell you that the username password is invalid which means Eclipse is properly configured with the jar   In Eclipse go to File - gt  Export - gt  Java - gt  Runnable Jar File   You will see this dialog   Make sure to set up the  save as ant script  checkbox   That is what makes it so you can use the commandline to do an ant jar later   Then go to the terminal and look at the ant script     So you see  I ran the jar and it didn t error out because it found the included mysql-connector-java-5 1 28-bin jar embedded inside Hello jar  Look inside Hello jar   vi Hello jar and you will see many references to com mysql jdbc stuff class To do ant jar on the commandline to do all this automatically  Rename buildant xml to build xml  and change the target name from create run jar to jar  Then  from within MyProject you type ant jar and boom   You ve got your jar inside MyProject   And you can invoke it using java -jar Hello jar and it all works

User · Answer

You can do this by writing a manifest for your jar  Have a look at the Class-Path header  Eclipse has an option for choosing your own manifest on export   The alternative is to add the dependency to the classpath at the time you invoke the application   win32  java exe -cp app jar dependency jar foo MyMainClass  nix   java -cp app jar dependency jar foo MyMainClass

User · Answer

Eclipse 3 5 has an option to package required libraries into the runnable jar  File -  Export    Choose runnable jar and click next  The runnable jar export window has a radio button where you can choose to package the required libraries into the jar

User · Answer

You can do this by writing a manifest for your jar  Have a look at the Class-Path header  Eclipse has an option for choosing your own manifest on export   The alternative is to add the dependency to the classpath at the time you invoke the application   win32  java exe -cp app jar dependency jar foo MyMainClass  nix   java -cp app jar dependency jar foo MyMainClass

User · Answer

How to include the jars of your project into your runnable jar  I m using Eclipse Version  3 7 2 running on Ubuntu 12 10   I ll also show you how to make the build xml so you can do the ant jar from command line and create your jar with other imported jars extracted into it  Basically you ask Eclipse to construct the build xml that imports your libraries into your jar for you   Fire up Eclipse and make a new Java project  make a new package  mypackage   add your main class  Runner  Put this code in there    Now include the mysql-connector-java-5 1 28-bin jar from Oracle which enables us to write Java to connect to the MySQL database   Do this by right clicking the project - gt  properties - gt  java build path - gt  Add External Jar - gt  pick mysql-connector-java-5 1 28-bin jar   Run the program within eclipse  it should run  and tell you that the username password is invalid which means Eclipse is properly configured with the jar   In Eclipse go to File - gt  Export - gt  Java - gt  Runnable Jar File   You will see this dialog   Make sure to set up the  save as ant script  checkbox   That is what makes it so you can use the commandline to do an ant jar later   Then go to the terminal and look at the ant script     So you see  I ran the jar and it didn t error out because it found the included mysql-connector-java-5 1 28-bin jar embedded inside Hello jar  Look inside Hello jar   vi Hello jar and you will see many references to com mysql jdbc stuff class To do ant jar on the commandline to do all this automatically  Rename buildant xml to build xml  and change the target name from create run jar to jar  Then  from within MyProject you type ant jar and boom   You ve got your jar inside MyProject   And you can invoke it using java -jar Hello jar and it all works

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