dont understand this xml line j2seproject

Question

im beginer developer and im build some project, this project show error

BUILD FAILED

D:\ForJob\source-archive(ANT)\apertum-qsystem\nbproject\build-impl.xml:951: The following error occurred while executing this line:

D:\ForJob\source-archive(ANT)\apertum-qsystem\nbproject\build-impl.xml:291: Compile failed; see the compiler error output for details.

<javac debug="@{debug}" deprecation="${javac.deprecation}" destdir="@{destdir}" encoding="${source.encoding}" excludes="@{excludes}" fork="${javac.fork}" includeantruntime="false" includes="@{includes}" source="${javac.source}" sourcepath="@{sourcepath}" srcdir="@{srcdir}" target="${javac.target}" tempdir="${java.io.tmpdir}">
                    <src>
                        <dirset dir="@{gensrcdir}" erroronmissingdir="false">
                            <include name="*"/>
                        </dirset>
                    </src>
                    <classpath>
                        <path path="@{classpath}"/>
                    </classpath>
                    <compilerarg line="${endorsed.classpath.cmd.line.arg}"/>
                    <compilerarg line="${javac.profile.cmd.line.arg}"/>
                    <compilerarg line="${javac.compilerargs}"/>
                    <compilerarg value="-processorpath"/>
                    <compilerarg path="@{processorpath}:${empty.dir}"/>
                    <compilerarg line="${ap.processors.internal}"/>
                    <compilerarg line="${annotation.processing.processor.options}"/>
                    <compilerarg value="-s"/>
                    <compilerarg path="@{apgeneratedsrcdir}"/>
                    <compilerarg line="${ap.proc.none.internal}"/>
                    <customize/>
                </javac>


<target depends="init,deps-jar,-pre-pre-compile,-pre-compile, -copy-persistence-xml,-compile-depend" if="have.sources" name="-do-compile">
        <j2seproject3:javac gensrcdir="${build.generated.sources.dir}"/>
        <copy todir="${build.classes.dir}">
            <fileset dir="${src.reports.dir}" excludes="${build.classes.excludes},${excludes}" includes="${includes}"/>
            <fileset dir="${src.dir}" excludes="${build.classes.excludes},${excludes}" includes="${includes}"/>
        </copy>
    </target>

Answer 1

You have shown us an Ant script which invokes the Java compiler to compile some Java code. Ant is reporting that the Java compiler has reported an error in your Java code, and is telling you to look at the compiler error messages for more details.

It's difficult to see what it is about that that you haven't understood.

By the way, this is not an XML question. The "xml" tag is for questions about XML, not for questions about technologies that happen to use XML somewhere in the stack.