Question

在运行简单的GWT应用程序时出错。当我跑过去时通过命令行蚂蚁工作正常，但导入后 IntelliJ我收到此错误。不知道为什么我要这个错误：
The code server is ready at http://127.0.0.1:9876/
Code server started in 9.247 s ms
2019-11-09 01:07:02.250:INFO:oejs.ServerConnector:main: Started ServerConnector@1d54b16e{HTTP/1.1}{127.0.0.1:9876}
2019-11-09 01:07:02.250:INFO:oejs.Server:main: Started @10313ms
**[ERROR] jreLeakPrevention.gcDaemonFail
java.lang.ClassNotFoundException: sun.misc.GC**
  at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:583)
  at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
  at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521)
  at java.base/java.lang.Class.forName0(Native Method)
  at java.base/java.lang.Class.forName(Class.java:315)
  at com.google.gwt.dev.shell.jetty.JettyLauncher.jreLeakPrevention(JettyLauncher.java:899)
  at com.google.gwt.dev.shell.jetty.JettyLauncher.start(JettyLauncher.java:722)
  at com.google.gwt.dev.DevMode.doStartUpServer(DevMode.java:636)
  at com.google.gwt.dev.DevModeBase.startUp(DevModeBase.java:923)
  at com.google.gwt.dev.DevModeBase.run(DevModeBase.java:706)
  at com.google.gwt.dev.DevMode.main(DevMode.java:432)
2019-11-09 01:07:02.307:INFO:oejs.Server:main: jetty-9.2.z-SNAPSHOT
Starting Jetty on port 8888
   [WARN] Failed startup of context c.g.g.d.s.j.WebAppContextWithReload@e59f292{/,file:/Users/pchenchala/Library/Caches/IntelliJIdea2019.2/gwt/mywebapp.4e8f7f71/MyWebApp.c24f5151/run/www/,STARTING}{/Users/pchenchala/Library/Caches/IntelliJIdea2019.2/gwt/mywebapp.4e8f7f71/MyWebApp.c24f5151/run/www}
java.lang.RuntimeException: Error scanning file GreetingServiceImpl.class
  at org.eclipse.jetty.annotations.AnnotationParser.parseDir(AnnotationParser.java:708)
  at org.eclipse.jetty.annotations.AnnotationParser.parseDir(AnnotationParser.java:688)
  at org.eclipse.jetty.annotations.AnnotationParser.parseDir(AnnotationParser.java:688)
  at org.eclipse.jetty.annotations.AnnotationParser.parseDir(AnnotationParser.java:688)
  at org.eclipse.jetty.annotations.AnnotationParser.parseDir(AnnotationParser.java:688)
  at org.eclipse.jetty.annotations.AnnotationParser.parse(AnnotationParser.java:824)
  at org.eclipse.jetty.annotations.AnnotationConfiguration$ParserTask.call(AnnotationConfiguration.java:163)
  at org.eclipse.jetty.annotations.AnnotationConfiguration$1.run(AnnotationConfiguration.java:548)
  at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:635)
  at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:555)
  at java.base/java.lang.Thread.run(Thread.java:834)
Caused by: java.lang.IllegalArgumentException
  at org.objectweb.asm.ClassReader.<init>(Unknown Source)
  at org.objectweb.asm.ClassReader.<init>(Unknown Source)
  at org.objectweb.asm.ClassReader.<init>(Unknown Source)
  at org.eclipse.jetty.annotations.AnnotationParser.scanClass(AnnotationParser.java:973)
  at org.eclipse.jetty.annotations.AnnotationParser.parseDir(AnnotationParser.java:702)
  ... 10 more
2019-11-09 01:07:05.521:INFO:oejs.ServerConnector:main: Started ServerConnector@539f3a98{HTTP/1.1}{127.0.0.1:8888}
2019-11-09 01:07:05.528:INFO:oejs.Server:main: Started @13591ms
Dev Mode initialized. Startup URL: 
http://127.0.0.1:8888/MyWebApp.html
[ERROR] 503 - GET /MyWebApp.html (127.0.0.1) 301 bytes
   Request headers
      Host: 127.0.0.1:8888
      Connection: keep-alive
      Upgrade-Insecure-Requests: 1
      User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.87
Safari / 537.36 安全提取用户：？1 接受：text / html，application / xhtml + xml，application / xml; q = 0.9，image / webp，image / apng， / ; q = 0.8，application / signed-exchange; v = b3 安全提取站点：无安全提取模式：导航接受编码：gzip，deflate，br 接受语言：en-GB，en-US; q = 0.9，en; q = 0.8 If-Modified-Since：Fri，08 Nov 2019 16:26:04 GMT 响应头日期：2019年11月8日星期五19:37:05 GMT 缓存控制：必须重新验证，无缓存，无存储内容类型：text / html;字符集= ISO-8859-1 内容长度：301 [错误] 503-GET /MyWebApp.html（127.0.0.1）301字节请求头主持人：127.0.0.1：8888 连接：保持活动状态快取控制：max-age = 0 不安全升级请求：1 用户代理：Mozilla / 5.0（Macintosh; Intel Mac OS X 10_14_3）AppleWebKit / 537.36（KHTML，如Gecko）Chrome / 78.0.3904.87 的Safari / 537.36 安全提取用户：？1 接受：text / html，application / xhtml + xml，application / xml; q = 0.9，image / webp，image / apng， / ; q = 0.8，application / signed-exchange; v = b3 安全提取站点：无安全提取模式：导航接受编码：gzip，deflate，br 接受语言：en-GB，en-US; q = 0.9，en; q = 0.8 响应头日期：2019年11月8日星期五19:39:53 GMT 缓存控制：必须重新验证，无缓存，无存储内容类型：text / html;字符集= ISO-8859-1 内容长度：301 GET / clean / mywebapp 清理磁盘缓存。在13ms内清除。 [错误] 503-GET /MyWebApp.html（127.0.0.1）301字节请求头主持人：127.0.0.1：8888 连接：保持活动状态快取控制：max-age = 0 不安全升级请求：1 用户代理：Mozilla / 5.0（Macintosh; Intel Mac OS X 10_14_3）AppleWebKit / 537.36（KHTML，如Gecko）Chrome / 78.0.3904.87 的Safari / 537.36 安全提取用户：？1 接受：text / html，application / xhtml + xml，application / xml; q = 0.9，image / webp，image / apng， / ; q = 0.8，application / signed-exchange; v = b3 安全提取站点：无安全提取模式：导航接受编码：gzip，deflate，br 接受语言：en-GB，en-US; q = 0.9，en; q = 0.8 响应头日期：2019年11月8日星期五19:52:14 GMT 缓存控制：必须重新验证，无缓存，无存储内容类型：text / html;字符集= ISO-8859-1 内容长度：301
Process finished with exit code 137 (interrupted by signal 9: SIGKILL)

Answer 1

这里有两个错误，它们是无关的。

java.lang.ClassNotFoundException: sun.misc.GC**
  at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:583)
  at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
  at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521)
  at java.base/java.lang.Class.forName0(Native Method)
  at java.base/java.lang.Class.forName(Class.java:315)
  at com.google.gwt.dev.shell.jetty.JettyLauncher.jreLeakPrevention(JettyLauncher.java:899)

这是可以忽略的。围绕此进行的检查可以防止这种情况的发生-您正在使用的JRE实现删除了此功能。在此GWT版本中检查JettyLauncher.java，您会发现以下代码： https://github.com/gwtproject/gwt/blob/a90832fec9a56f4cb83ed009c7048e0a8d196fe8/dev/core/src/com/google/gwt/dev/shell/jetty/JettyLauncher.java#L898-L915

    try {
      Class<?> clazz = Class.forName("sun.misc.GC");
      Method method = clazz.getDeclaredMethod("requestLatency",
          new Class[]{long.class});
      method.invoke(null, Long.valueOf(3600000));
    } catch (ClassNotFoundException e) {
      logger.log(TreeLogger.ERROR, "jreLeakPrevention.gcDaemonFail", e);
    } catch (SecurityException e) {
      logger.log(TreeLogger.ERROR, "jreLeakPrevention.gcDaemonFail", e);
    } catch (NoSuchMethodException e) {
      logger.log(TreeLogger.ERROR, "jreLeakPrevention.gcDaemonFail", e);
    } catch (IllegalArgumentException e) {
      logger.log(TreeLogger.ERROR, "jreLeakPrevention.gcDaemonFail", e);
    } catch (IllegalAccessException e) {
      logger.log(TreeLogger.ERROR, "jreLeakPrevention.gcDaemonFail", e);
    } catch (InvocationTargetException e) {
      logger.log(TreeLogger.ERROR, "jreLeakPrevention.gcDaemonFail", e);
    }

这些catch语句使我们记录错误，然后继续。

第二个例外：

  [WARN] Failed startup of context c.g.g.d.s.j.WebAppContextWithReload@e59f292{/,file:/Users/pchenchala/Library/Caches/IntelliJIdea2019.2/gwt/mywebapp.4e8f7f71/MyWebApp.c24f5151/run/www/,STARTING}{/Users/pchenchala/Library/Caches/IntelliJIdea2019.2/gwt/mywebapp.4e8f7f71/MyWebApp.c24f5151/run/www}
java.lang.RuntimeException: Error scanning file GreetingServiceImpl.class
  at org.eclipse.jetty.annotations.AnnotationParser.parseDir(AnnotationParser.java:708)
  at org.eclipse.jetty.annotations.AnnotationParser.parseDir(AnnotationParser.java:688)
  at org.eclipse.jetty.annotations.AnnotationParser.parseDir(AnnotationParser.java:688)
  at org.eclipse.jetty.annotations.AnnotationParser.parseDir(AnnotationParser.java:688)
  at org.eclipse.jetty.annotations.AnnotationParser.parseDir(AnnotationParser.java:688)
  at org.eclipse.jetty.annotations.AnnotationParser.parse(AnnotationParser.java:824)
  at org.eclipse.jetty.annotations.AnnotationConfiguration$ParserTask.call(AnnotationConfiguration.java:163)
  at org.eclipse.jetty.annotations.AnnotationConfiguration$1.run(AnnotationConfiguration.java:548)
  at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:635)
  at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:555)
  at java.base/java.lang.Thread.run(Thread.java:834)
Caused by: java.lang.IllegalArgumentException
  at org.objectweb.asm.ClassReader.<init>(Unknown Source)
  at org.objectweb.asm.ClassReader.<init>(Unknown Source)
  at org.objectweb.asm.ClassReader.<init>(Unknown Source)
  at org.eclipse.jetty.annotations.AnnotationParser.scanClass(AnnotationParser.java:973)
  at org.eclipse.jetty.annotations.AnnotationParser.parseDir(AnnotationParser.java:702)
  ... 10 more

这是一个单独的错误，与以上内容或您的帖子标题无关。我不太确定这里发生了什么-最好的猜测是，您有一些字节码，扫描时asm无法读取。也许清理您的项目然后重试？

您最好只发布有关此错误的信息，因为另一个错误只是一个红色的鲱鱼。

jreLeakPrevention.gcDaemonFail运行GWT应用程序时出错

1 个答案: