问题
I am upgrading my IDE to newest versions of netbeans (11.0) and jdk (12.0). When i make a simple basic Web Application With Ant Project, i can't compile it because the output shows following error message:
error: option -Xbootclasspath/p: not allowed with target 12 BUILD FAILED (total time: 1 second)
Obviously Ant script uses this option and jdk 12 does not allow it? But how to fix this??
EDIT: this is the section (build-impl.xml) where the option -Xbootclasspath is used. This is a netbeans generated script. If i remove the option completely, compilation succeeds and application seems to work
<target depends="-pre-init,-init-private,-init-libraries,-init-user,-init-project,-init-macrodef-property" name="-do-init">
<condition property="have.tests">
<or>
<available file="${test.src.dir}"/>
</or>
</condition>
<condition property="have.sources">
<or>
<available file="${src.dir}"/>
</or>
</condition>
<condition property="netbeans.home+have.tests">
<and>
<isset property="netbeans.home"/>
<isset property="have.tests"/>
</and>
</condition>
<condition property="no.javadoc.preview">
<isfalse value="${javadoc.preview}"/>
</condition>
<property name="javac.compilerargs" value=""/>
<condition property="no.deps">
<and>
<istrue value="${no.dependencies}"/>
</and>
</condition>
<condition property="no.dist.ear.dir">
<not>
<isset property="dist.ear.dir"/>
</not>
</condition>
<property name="build.web.excludes" value="${build.classes.excludes}"/>
<condition property="do.compile.jsps">
<istrue value="${compile.jsps}"/>
</condition>
<condition property="do.debug.server">
<or>
<not>
<isset property="debug.server"/>
</not>
<istrue value="${debug.server}"/>
<and>
<not>
<istrue value="${debug.server}"/>
</not>
<not>
<istrue value="${debug.client}"/>
</not>
</and>
</or>
</condition>
<condition property="do.debug.client">
<istrue value="${debug.client}"/>
</condition>
<condition property="do.display.browser">
<istrue value="${display.browser}"/>
</condition>
<condition property="do.display.browser.debug.old">
<and>
<isset property="do.display.browser"/>
<not>
<isset property="do.debug.client"/>
</not>
<not>
<isset property="browser.context"/>
</not>
</and>
</condition>
<condition property="do.display.browser.debug">
<and>
<isset property="do.display.browser"/>
<not>
<isset property="do.debug.client"/>
</not>
<isset property="browser.context"/>
</and>
</condition>
<available file="${conf.dir}/MANIFEST.MF" property="has.custom.manifest"/>
<available file="${persistence.xml.dir}/persistence.xml" property="has.persistence.xml"/>
<condition property="do.war.package.with.custom.manifest">
<isset property="has.custom.manifest"/>
</condition>
<condition property="do.war.package.without.custom.manifest">
<not>
<isset property="has.custom.manifest"/>
</not>
</condition>
<condition property="do.tmp.war.package.with.custom.manifest">
<and>
<isset property="has.custom.manifest"/>
<or>
<isfalse value="${directory.deployment.supported}"/>
<isset property="dist.ear.dir"/>
</or>
</and>
</condition>
<condition property="do.tmp.war.package.without.custom.manifest">
<and>
<not>
<isset property="has.custom.manifest"/>
</not>
<or>
<isfalse value="${directory.deployment.supported}"/>
<isset property="dist.ear.dir"/>
</or>
</and>
</condition>
<condition property="do.tmp.war.package">
<or>
<isfalse value="${directory.deployment.supported}"/>
<isset property="dist.ear.dir"/>
</or>
</condition>
<property name="build.meta.inf.dir" value="${build.web.dir}/META-INF"/>
<condition else="" property="application.args.param" value="${application.args}">
<and>
<isset property="application.args"/>
<not>
<equals arg1="${application.args}" arg2="" trim="true"/>
</not>
</and>
</condition>
<property name="source.encoding" value="${file.encoding}"/>
<condition property="javadoc.encoding.used" value="${javadoc.encoding}">
<and>
<isset property="javadoc.encoding"/>
<not>
<equals arg1="${javadoc.encoding}" arg2=""/>
</not>
</and>
</condition>
<property name="javadoc.encoding.used" value="${source.encoding}"/>
<property name="includes" value="**"/>
<property name="excludes" value=""/>
<property name="runmain.jvmargs" value=""/>
<path id="endorsed.classpath.path" path="${endorsed.classpath}"/>
<condition else="" property="endorsed.classpath.cmd.line.arg" value="-Xbootclasspath/p:'${toString:endorsed.classpath.path}'">
<and>
<isset property="endorsed.classpath"/>
<length length="0" string="${endorsed.classpath}" when="greater"/>
</and>
</condition>
<condition else="false" property="jdkBug6558476">
<and>
<matches pattern="1\.[56]" string="${java.specification.version}"/>
<not>
<os family="unix"/>
</not>
</and>
</condition>
<property name="javac.fork" value="${jdkBug6558476}"/>
<condition property="junit.available">
<or>
<available classname="org.junit.Test" classpath="${run.test.classpath}"/>
<available classname="junit.framework.Test" classpath="${run.test.classpath}"/>
</or>
</condition>
<condition property="testng.available">
<available classname="org.testng.annotations.Test" classpath="${run.test.classpath}"/>
</condition>
<condition property="junit+testng.available">
<and>
<istrue value="${junit.available}"/>
<istrue value="${testng.available}"/>
</and>
</condition>
<condition else="testng" property="testng.mode" value="mixed">
<istrue value="${junit+testng.available}"/>
</condition>
<condition else="" property="testng.debug.mode" value="-mixed">
<istrue value="${junit+testng.available}"/>
</condition>
</target>
回答1:
To compile the project on JDK12, simply set empty value to endorsed.classpath= at project.properties file.
回答2:
-Xbootclasspath and -Xbootclasspath/p: (prepend) were removed in JDK9. You can still use -Xbootclasspath/a: to append stuff to the bootstrap class path.
回答3:
I just noticed that netbeans 11 recommends using JDK 8 with it instead of newer versions. So i'm going back to JDK 8.. ("problem" solved).
回答4:
I changed the
-Xbootclasspath/p
to
-J-Xbootclasspath/a
It's working for me.
来源：https://stackoverflow.com/questions/56272364/error-option-xbootclasspath-p-not-allowed-with-target-12-netbeans-11-0