我有一些使用JAXB API类的代码,这些类已作为Java 6/7/8中的JDK的一部分提供。当我用Java 9运行相同的代码时,在运行时得到错误,指示找不到JAXB类。
从Java 6开始,JAXB类就作为JDK的一部分提供了,那么为什么Java 9再也找不到这些类了呢?
我有一些使用JAXB API类的代码,这些类已作为Java 6/7/8中的JDK的一部分提供。当我用Java 9运行相同的代码时,在运行时得到错误,指示找不到JAXB类。
从Java 6开始,JAXB类就作为JDK的一部分提供了,那么为什么Java 9再也找不到这些类了呢?
当前回答
在编译和运行时,添加开关——add-modules java.xml.bind
javac --add-modules java.xml.bind <java file name>
java --add-modules java.xml.bind <class file>
JDK 9模块的良好介绍也可以在以下位置找到: https://www.youtube.com/watch?v=KZfbRuvv5qc
其他回答
使用JDK 9+时,需要添加JAX-B依赖项。对于Android Studio用户,您需要将此添加到您的构建中。Gradle的dependencies{}块:
// Add missing dependencies for JDK 9+
if (JavaVersion.current().ordinal() >= JavaVersion.VERSION_1_9.ordinal()) {
// If you're using @AutoValue or any libs that requires javax.annotation (like Dagger)
compileOnly 'com.github.pengrad:jdk9-deps:1.0'
compileOnly 'javax.annotation:javax.annotation-api:1.3.2'
// If you're using Kotlin
kapt "com.sun.xml.bind:jaxb-core:2.3.0.1"
kapt "javax.xml.bind:jaxb-api:2.3.1"
kapt "com.sun.xml.bind:jaxb-impl:2.3.2"
// If you're using Java
annotationProcessor "com.sun.xml.bind:jaxb-core:2.3.0.1"
annotationProcessor "javax.xml.bind:jaxb-api:2.3.1"
testAnnotationProcessor "com.sun.xml.bind:jaxb-core:2.3.0.1"
testAnnotationProcessor "javax.xml.bind:jaxb-api:2.3.1"
}
旧答案“问题通过切换到amazoncorretto解决” 新闻回答:我使用了最新的corretto,但类似jdk 1.8。无论如何,我们需要手动添加依赖项
在编译和运行时,添加开关——add-modules java.xml.bind
javac --add-modules java.xml.bind <java file name>
java --add-modules java.xml.bind <class file>
JDK 9模块的良好介绍也可以在以下位置找到: https://www.youtube.com/watch?v=KZfbRuvv5qc
不是答案,而是一个附录:我得到的原因是,如果JAVA_HOME指向Java 9安装(准确地说是Java版本“9.0.1”),则运行groovysh (Groovy 2.4.13)会失败:
java.lang.reflect.InvocationTargetException
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at org.codehaus.groovy.tools.GroovyStarter.rootLoader(GroovyStarter.java:107)
at org.codehaus.groovy.tools.GroovyStarter.main(GroovyStarter.java:129)
Caused by: java.lang.NoClassDefFoundError: Unable to load class groovy.xml.jaxb.JaxbGroovyMethods due to missing dependency javax/xml/bind/JAXBContext
at org.codehaus.groovy.vmplugin.v5.Java5.configureClassNode(Java5.java:400)
at org.codehaus.groovy.ast.ClassNode.lazyClassInit(ClassNode.java:277)
at org.codehaus.groovy.ast.ClassNode.getMethods(ClassNode.java:397)
...
..
.
..
...
at org.codehaus.groovy.tools.shell.Groovysh.<init>(Groovysh.groovy:135)
at org.codehaus.groovy.vmplugin.v7.IndyInterface.selectMethod(IndyInterface.java:232)
at org.codehaus.groovy.tools.shell.Main.<init>(Main.groovy:66)
at org.codehaus.groovy.vmplugin.v7.IndyInterface.selectMethod(IndyInterface.java:232)
at org.codehaus.groovy.tools.shell.Main.main(Main.groovy:163)
... 6 more
解决方案是:
Go to the JAXB Project at github.io ("JAXB is licensed under a dual license - CDDL 1.1 and GPL 2.0 with Class-path Exception") Download jaxb-ri-2.3.0.zip Unzip wherever you put your java infrastructure files (in my case, /usr/local/java/jaxb-ri/). Other solution may exist (maybe via SDKMAN, I dunno) Make sure the jars in the lib subdirectory are on the CLASSPATH. I do it via a script started on bash startup, called /etc/profile.d/java.sh, where I added (among many other lines) the following loop:
打包到函数中…
function extend_qzminynshg {
local BASE="/usr/local/java"
for LIB in jaxb-api.jar jaxb-core.jar jaxb-impl.jar jaxb-jxc.jar jaxb-xjc.jar; do
local FQLIB="$BASE/jaxb-ri/lib/$LIB"
if [[ -f $FQLIB ]]; then
export CLASSPATH=$FQLIB:$CLASSPATH
fi
done
}
extend_qzminynshg; unset extend_qzminynshg
它确实有效!
为了解决这个问题,我在我的项目中导入了一些JAR文件:
javax.activation-1.2.0.jar
http://search.maven.org/remotecontent?filepath=com/sun/activation/javax.activation/1.2.0/javax.activation-1.2.0.jar
jaxb-api-2.3.0.jar
http://search.maven.org/remotecontent?filepath=javax/xml/bind/jaxb-api/2.3.0/jaxb-api-2.3.0.jar
jaxb-core-2.3.0.jar
http://search.maven.org/remotecontent?filepath=com/sun/xml/bind/jaxb-core/2.3.0/jaxb-core-2.3.0.jar
jaxb-impl-2.3.0.jar
http://search.maven.org/remotecontent?filepath=com/sun/xml/bind/jaxb-impl/2.3.0/jaxb-impl-2.3.0.jar
下载以上文件并复制到项目的libs文件夹中 在Java Build Path中添加导入的JAR文件