如何修复maven错误：java.lang.NullPointerException：charsetName whean

我尝试执行mvn package为我的项目，但总是得到错误。如何修复maven错误：java.lang.NullPointerException：charsetName whean

在我的pom.xml我添加跟着属性：

<properties> 
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> 
    <project.resources.sourceEncoding>UTF-8</project.resources.sourceEncoding> 
</properties> 
... 
<plugin> 
    <artifactId>maven-compiler-plugin</artifactId> 
     <configuration> 
      <outputEncoding>UTF-8</outputEncoding> 
      <argLine>-Dfile.encoding=UTF-8</argLine> 
      <encoding>${project.build.sourceEncoding}</encoding> 
      <source>1.5</source> 
      <target>1.5</target> 
     </configuration> 
     <version>3.0</version> 
</plugin>

和运行>mvn package -Dfile.encoding=UTF-8，但没有成功：

java.lang.NullPointerException: charsetName 
    at java.io.OutputStreamWriter.<init>(OutputStreamWriter.java:99) 
    at org.apache.jasper.compiler.JDTJavaCompiler.getJavaWriter(JDTJavaCompiler.java:120) 
    at org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:146) 
    at org.apache.jasper.compiler.Compiler.compile(Compiler.java:362) 
    at org.apache.jasper.JspC.processFile(JspC.java:1137) 
    at org.apache.jasper.JspC.execute(JspC.java:1306) 
    at com.reucon.maven.plugin.openfire.jspc.JspcMojo.compile(JspcMojo.java:279) 
    at com.reucon.maven.plugin.openfire.jspc.JspcMojo.execute(JspcMojo.java:196) 
    at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:134) 
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:208) 
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153) 
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145) 
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:116) 
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:80) 
    at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuilder.java:51) 
    at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:128) 
    at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:307) 
    at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:193) 
    at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:106) 
    at org.apache.maven.cli.MavenCli.execute(MavenCli.java:862) 
    at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:286) 
    at org.apache.maven.cli.MavenCli.main(MavenCli.java:197) 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
    at java.lang.reflect.Method.invoke(Method.java:497) 
    at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:289) 
    at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229) 
    at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415) 
    at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356)

错误抛出这个代码：

public OutputStreamWriter(OutputStream out, String charsetName) throws UnsupportedEncodingException { 
    super(out); 
    if (charsetName == null) 
     throw new NullPointerException("charsetName"); 
    se = StreamEncoder.forOutputStreamWriter(out, this, charsetName); 
}

帮助我请修复错误。我已经失去了5个小时。

这个问题不重复it，因为我查询了maven。

感谢您的提前！在你的pom.xml

来源

2015-11-19 slesh

请修正天马称号。谢谢。 – slesh

另外我尝试添加<％@ page language =“java”contentType =“text/html; charset = UTF-8”pageEncoding =“UTF-8”％>并且也没有成功。 – slesh

另外我尝试在其他IDE（IntellJIDEA）中执行此操作，并且也失败。 – slesh

认沽javaEncoding元素

<plugin> 
    <groupId>com.reucon.maven.plugins</groupId> 
    <artifactId>maven-openfire-plugin</artifactId> 
    <extensions>true</extensions> 
    <configuration> 
     <javaEncoding>UTF-8</javaEncoding> 
    </configuration> 
    <version>1.0.2-SNAPSHOT</version> 
    </plugin>

来源

2017-02-22 08:54:06 pburlov

嗨，谢谢你的回答，但问题实际上现在不是 – slesh

如何修复maven错误：java.lang.NullPointerException：charsetName whean

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