Groovy腳本運行java主類

Question

我有下面的代碼主要類，我試圖用gradle運行。我在下面附加了java和gradle腳本的示例主類。

public class Hello { 
    public static void main(String[] args) throws IOException { 

     System.out.println("This is file system watch service"); 
     Path dir = Paths.get("c:\\sid\\"); 
     WatchService service = FileSystems.getDefault().newWatchService(); 
     WatchKey key = dir.register(service, ENTRY_CREATE); 

     System.out.println("Watching directory: "+dir.toString()); 
     //file creation logic 
     while(true) { 
     for (WatchEvent<?> event: key.pollEvents()) { 
      WatchEvent.Kind<?> kind = event.kind(); 
      if (kind == OVERFLOW) { 
       continue; 
      } 

      WatchEvent<Path> ev = (WatchEvent<Path>)event; 
      Path filename = ev.context(); 
     } 
     } 
    } 
} 

而且我gradle這個腳本如下

apply plugin: 'java' 
task hello1 << { 
    def process = ['java', '-cp', 'sourceSets.main.runtimeClasspath', 'com.test.gradle.Hello'].execute() 
    process.in.close() 
    process.out.close() 
    process.err.close() 
} 

task hello << { 
    ant.java(classpath:'sourceSets.main.runtimeClasspath', classname:'com.test.gradle.Hello', fork:'true') 
    ant.echo('Done') 
} 

當我打電話gradle這個hello1從命令提示符它說，成功打造但是似乎我的主要程序永遠不會被執行。要查看主程序的執行情況，我已經使用PrintWriter添加了示例sysout和文件創建邏輯。 我也試過用螞蟻與gradle hello這也是行不通的。

現在，當我使用gradle這個任務，因爲下方拆下叉真正從以前的

task hello << { 
    ant.java(classpath:'sourceSets.main.runtimeClasspath.asPath', classname:'com.test.gradle.Hello.class') 
    ant.echo('Done') 

} 

it is generating below exception 

[ant:java] Could not find com.test.gradle.Hello.class. Make sure you have it in 
your classpath 
     at org.apache.tools.ant.taskdefs.ExecuteJava.execute(ExecuteJava.java:13 
8) 
     at org.apache.tools.ant.taskdefs.Java.run(Java.java:771) 
     at org.apache.tools.ant.taskdefs.Java.executeJava(Java.java:221) 
     at org.apache.tools.ant.taskdefs.Java.executeJava(Java.java:135) 
     at org.apache.tools.ant.taskdefs.Java.execute(Java.java:108) 
     at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:292) 
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl. 
java:57) 
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces 
sorImpl.java:43) 
     at java.lang.reflect.Method.invoke(Method.java:601) 
     at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.jav 
a:106) 
     at groovy.util.AntBuilder.performTask(AntBuilder.java:319) 
     at groovy.util.AntBuilder.nodeCompleted(AntBuilder.java:264) 
     at org.gradle.api.internal.project.ant.BasicAntBuilder.nodeCompleted(Bas 
icAntBuilder.java:72) 
     at groovy.util.BuilderSupport.doInvokeMethod(BuilderSupport.java:147) 
     at groovy.util.AntBuilder.doInvokeMethod(AntBuilder.java:203) 
     at org.gradle.api.internal.project.ant.BasicAntBuilder.doInvokeMethod(Ba 
sicAntBuilder.java:87) 
     at groovy.util.BuilderSupport.invokeMethod(BuilderSupport.java:64) 
     at org.codehaus.groovy.runtime.callsite.PogoMetaClassSite.call(PogoMetaC 
lassSite.java:45) 
     at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSi 
teArray.java:45) 
     at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCa 
llSite.java:108) 
     at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCa 
llSite.java:116) 
     at build_1dcr9mg141bsc4tjjgplovccq0$_run_closure2.doCall(C:\Users\sumit\ 
workspace1\gradleTest\build.gradle:13) 
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl. 
java:57) 
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces 
sorImpl.java:43) 
     at java.lang.reflect.Method.invoke(Method.java:601) 
     at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java: 
90) 

Answer 1

試試這個

javaexec { 
    main = 'com.pack.YourClass' 
    classpath(sourceSets.src.output.classesDir, sourceSets.src.compileClasspath) 
    args(arg1, arg2) 
}