我正在将 IDE 升级到最新版本的 netbeans (11.0) 和 jdk (12.0)。当我使用 Ant 项目制作一个简单的基本 Web 应用程序时，我无法编译它，因为输出显示以下错误消息：
错误：选项 -Xbootclasspath/p：目标 12 不允许
构建失败（总时间：1秒）
显然 Ant 脚本使用了这个选项，而 jdk 12 不允许它？但如何解决这个问题？
编辑：这是使用选项 -Xbootclasspath 的部分（build-impl.xml）。这是一个 netbeans 生成的脚本。如果我完全删除该选项，编译会成功并且应用程序似乎可以工作
<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>
要在 JDK12 上编译项目，只需将空值设置为endorsed.classpath= at project.properties file.
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