相关疑难解决方法(0)

今天我尝试了最新的jdk9 Build 113,并尝试使用最新的Maven 3.3.9 编译我的项目

这些是命令(部分通过twitter发现)

export MVN_OPTS="-Dmaven.compiler.fork -Dmaven.compiler.executable=/somewhere/Downloads/jdk-9/bin/javac"
export JAVA_HOME="/somewhere/Downloads/jdk-9"
mvn clean install

但是我得到了这个错误 ......简而言之:

[WARNING] Error injecting: org.codehaus.plexus.archiver.jar.JarArchiver
java.lang.ExceptionInInitializerError
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(java.base@9-ea/Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(java.base@9-ea/NativeConstructorAccessorImpl.java:62)

...

at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356)
Caused by: java.lang.ArrayIndexOutOfBoundsException: 1
    at org.codehaus.plexus.archiver.zip.AbstractZipArchiver.<clinit>(AbstractZipArchiver.java:116)
    ... 89 more
[WARNING] Error injecting: org.apache.maven.plugin.jar.JarMojo
java.lang.ExceptionInInitializerError
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(java.base@9-ea/Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(java.base@9-ea/NativeConstructorAccessorImpl.java:62)

...

at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415)
    at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356)
Caused by: java.lang.ArrayIndexOutOfBoundsException: 1
    at org.codehaus.plexus.archiver.zip.AbstractZipArchiver.<clinit>(AbstractZipArchiver.java:116)
    ... 89 more

什么是正确的maven配置或用于JDK9的参数？

$ mvn --version
Apache Maven 3.3.9 (bb52d8502b132ec0a5a3f4c09453c07478323dc5; 2015-11-10T17:41:47+01:00)
Maven home: /home/somewhere/Downloads/maven …

在stackoverflow上多次提到自动模块,但我找不到自动模块的完整,简洁和自给自足的定义.

那么,什么是自动模块？它是否导出所有包裹？它打开所有包裹吗？它是否读取所有其他模块？

在将我们的一个项目迁移到Java 9(build 9 + 181)时,我遇到了一个特殊的问题,在类型推断和java模块相关的某些库中看起来像是一个不正确的实现.我使用的是dropwizard-core(1.1.0)和guice(4.1.0)配置如下:

public class CustomService extends io.dropwizard.Application<CustomServiceConfig> {

    public static void main(String[] args) throws Exception {
        new CustomService().run(args);
    }

    // other initializations

    @Override
    public void run(CustomServiceConfig config, io.dropwizard.setup.Environment environment) throws Exception {
        com.google.inject.Injector injector = createInjector(config, environment);
        environment.jersey().register(injector.getInstance(SomeResource.class)); //line 45
        environment.healthChecks().register("DBHealth", injector.getInstance(HealthCheck.class)); 
        environment.servlets().addFilter("Filter-Name", SomeFilter.class)
                .addMappingForUrlPatterns(EnumSet.allOf(DispatcherType.class), true, "/*");
    }


    private com.google.inject.Injector createInjector(CustomServiceConfig config, Environment environment) {
        return com.google.inject.Guice.createInjector(new CustomServiceModule(config, environment));
    }

}

public class CustomServiceModule extends com.google.inject.AbstractModule { …