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Home/ Questions/What is the bootstrap class path not set in conjunction with 1.5 problem, and how to solve it?
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Imogen Garcia
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Imogen Garcia
Asked: May 18, 20222022-05-18T20:56:49+00:00 2022-05-18T20:56:49+00:00In: java

What is the bootstrap class path not set in conjunction with 1.5 problem, and how to solve it?

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I get an error

warning: [options] bootstrap class path not set in conjunction with -source 1.5

when trying to use bootstrap for my job. How to fix the bootstrap class path not set in conjunction with 1.5 error? Please give me some advice.

bootstrap class path not set in conjunction with 1.5
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    lyytutoria Expert
    2022-06-29T03:51:08+00:00Added an answer on June 29, 2022 at 3:51 am

    The cause:

    You get this error because you did not set the bootclasspath based on rt.jar for the compilation purpose, so Javac will strictly use the new libraries along with the old language rules, which lead to class files that are incompatible with earlier platforms because they contain references to non-existent methods. Therefore, it raises an error.

    Solution:

    The correct procedure to cross-compile javac from the JDK N to an earlier platform version is:

    1, Using the default configuration for -source.
    2, Set the rt.jar (or corresponding) for the earlier platform’s bootclasspath to compile against.

    If you do as the above suggestions, your problem will be solved.

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  2. Zoé Gerard
    2022-05-25T21:11:11+00:00Added an answer on May 25, 2022 at 9:11 pm


    Bootclasspath usage

    javac -bootclasspath /usr/lib/jvm/java-7-oracle/jre/lib/rt.jar \
     -source 1.7 Main.java

    Locate rt.jar on UNIX systems using:

    locate -r '/rt.jar
     

    JAVA_HOME should be set so rt.jar is located in $JAVA_HOME/jre/lib/rt.jar

    javac -source 1.7 -bootclasspath "$JAVA_HOME/jre/lib/rt.jar" Main.java

    Tested with Ubuntu 14.04 and Oracle Java 7.

    JAVA_HOME should be set so rt.jar is located in $JAVA_HOME/jre/lib/rt.jar

    javac -source 1.7 -bootclasspath "$JAVA_HOME/jre/lib/rt.jar" Main.java

    Tested with Ubuntu 14.04 and Oracle Java 7.

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