運行 GWT 應用程序時出現 jreLeakPrevention.gcDaemonFail 錯誤

Question

運行簡單的 GWT 應用程序時出錯。 當我通過命令行運行 ant 時，它運行良好，但在 IntelliJ 中導入后，我收到此錯誤。 不知道為什么我會收到此錯誤：

 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$AppClassLoader.loadClass(ClassLoaders.java:178) at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521) at java.base/java.lang.Class.forName0(Native Method) at java.base/java.lang.Class.forName(Class.java:315) at com.google.gwt.dev.shell.jetty.JettyLauncher.jreLeakPrevention(JettyLauncher.java:899) at com.google.gwt.dev.shell.jetty.JettyLauncher.start(JettyLauncher.java:722) at com.google.gwt.dev.DevMode.doStartUpServer(DevMode.java:636) at com.google.gwt.dev.DevModeBase.startUp(DevModeBase.java:923) at com.google.gwt.dev.DevModeBase.run(DevModeBase.java:706) at com.google.gwt.dev.DevMode.main(DevMode.java:432) 2019-11-09 01:07:02.307:INFO:oejs.Server:main: jetty-9.2.z-SNAPSHOT Starting Jetty on port 8888 [WARN] Failed startup of context c.ggdsjWebAppContextWithReload@e59f292{/,file:/Users/pchenchala/Library/Caches/IntelliJIdea2019.2/gwt/mywebapp.4e8f7f71/MyWebApp.c24f5151/run/www/,STARTING}{/Users/pchenchala/Library/Caches/IntelliJIdea2019.2/gwt/mywebapp.4e8f7f71/MyWebApp.c24f5151/run/www} java.lang.RuntimeException: Error scanning file GreetingServiceImpl.class at org.eclipse.jetty.annotations.AnnotationParser.parseDir(AnnotationParser.java:708) at org.eclipse.jetty.annotations.AnnotationParser.parseDir(AnnotationParser.java:688) at org.eclipse.jetty.annotations.AnnotationParser.parseDir(AnnotationParser.java:688) at org.eclipse.jetty.annotations.AnnotationParser.parseDir(AnnotationParser.java:688) at org.eclipse.jetty.annotations.AnnotationParser.parseDir(AnnotationParser.java:688) at org.eclipse.jetty.annotations.AnnotationParser.parse(AnnotationParser.java:824) at org.eclipse.jetty.annotations.AnnotationConfiguration$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 Sec-Fetch-User: ?1 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng, / ;q=0.8,application/signed-exchange ;v=b3 Sec-Fetch-Site: none Sec-Fetch-Mode: navigate Accept-Encoding: gzip, deflate, br Accept-Language: en-GB,en-US;q=0.9,en;q=0.8 If-修改時間：格林威治標准時間 2019 年 11 月 8 日星期五 16:26:04 響應標頭日期：格林威治標准時間 2019 年 11 月 8 日星期五 19:37:05 緩存控制：必須重新驗證，無緩存，無存儲內容類型：文本/html; charset=ISO-8859-1 Content-Length: 301 [ERROR] 503 - GET /MyWebApp.html (127.0.0.1) 301 bytes 請求頭 Host: 127.0.0.1:8888 Connection: keep-alive Cache-Control: max-age =0 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 Sec-Fetch-User: ?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 Sec-Fetch-Site: none Sec-Fetch-Mode: 導航 Accept-Encoding: gzip, deflate, br Accept-Language: en-GB,en-US;q=0.9,en;q=0.8 Response headers Date: Fri, 08 Nov 2019 19:39: 53 GMT Cache-Control: must-revalidate,no-cache,no-store Content-Type: text/html; charset=ISO-8859-1 Content-Length: 301 GET /clean/mywebapp 清理磁盤緩存。 在 13 毫秒內清理完畢。 [錯誤] 503 - GET /MyWebApp.html (127.0.0.1) 301 字節請求標頭主機：127.0.0.1:8888 連接：保持活動緩存控制：max-age=0 升級不安全請求：1 用戶代理: 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 Sec-Fetch-User: ?1 Accept: text/html,application/xhtml+xml, application/xml;q=0.9,image/webp,image/apng, / ;q=0.8,application/signed-exchange;v=b3 Sec-Fetch-Site: none Sec-Fetch-Mode: navigate Accept-Encoding: gzip , 放氣, br Accept-Language: en-GB,en-US;q=0.9,en;q=0.8 響應標頭日期: Fri, 08 Nov 2019 19:52:14 GMT Cache-Control: must-revalidate,no-緩存，無存儲內容類型：文本/html； charset=ISO-8859-1 內容長度：301

 Process finished with exit code 137 (interrupted by signal 9: SIGKILL)

Answer 1

這里有兩個錯誤，它們是不相關的。

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)

這是可以安全忽略的。 圍繞這一點的檢查是為了防止這種事情發生 - 您正在使用的 JRE 實現刪除了這個特性。 Examining JettyLauncher.java in this version of GWT, you find the following code: 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);
    }

這些 catch 語句讓我們記錄錯誤，然后恢復。

---

第二個例外：

  [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

這是一個單獨的錯誤，與上述內容或您的帖子標題無關。 我不太確定這里發生了什么——最好的猜測是，你有一些字節碼，asm 在掃描時無法讀取。 也許清理您的項目並重試？

僅發布有關此錯誤的消息可能會更好，因為另一個錯誤只是紅鯡魚。