Java org.apache.tomcat.websocket.server.WsFilter.doFilter

我得到了一个

javax.servlet.ServletException:servlet执行在
ApacheTomcat
上部署.war时引发了一个异常

例外情况

org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)

根本原因

java.lang.ExceptionInInitializerError
java.base/java.lang.Class.forName0(Native Method)
java.base/java.lang.Class.forName(Class.java:398)
org.zkoss.lang.Classes.forNameByThread(Classes.java:274)
org.zkoss.lang.ImportedClassResolver.resolveClass(ImportedClassResolver.java:129)
org.zkoss.zk.ui.impl.PageImpl.resolveClass(PageImpl.java:575)
org.zkoss.zk.ui.impl.AbstractUiFactory.newComposer(AbstractUiFactory.java:184)
org.zkoss.zk.ui.impl.Utils.newComposer(Utils.java:91)
org.zkoss.zk.ui.metainfo.ComponentInfo.toComposer(ComponentInfo.java:360)
org.zkoss.zk.ui.metainfo.ComponentInfo.toComposers(ComponentInfo.java:330)
org.zkoss.zk.ui.metainfo.ComponentInfo.resolveComposer(ComponentInfo.java:318)
org.zkoss.zk.ui.impl.UiEngineImpl.execCreateChild0(UiEngineImpl.java:901)
org.zkoss.zk.ui.impl.UiEngineImpl.execCreateChild(UiEngineImpl.java:894)
org.zkoss.zk.ui.impl.UiEngineImpl.execCreate0(UiEngineImpl.java:781)
org.zkoss.zk.ui.impl.UiEngineImpl.execCreateChild(UiEngineImpl.java:841)
org.zkoss.zk.ui.impl.UiEngineImpl.execCreate0(UiEngineImpl.java:799)
org.zkoss.zk.ui.impl.UiEngineImpl.execCreate(UiEngineImpl.java:745)
org.zkoss.zk.ui.impl.UiEngineImpl.execNewPage0(UiEngineImpl.java:466)
org.zkoss.zk.ui.impl.UiEngineImpl.execNewPage(UiEngineImpl.java:374)
org.zkoss.zk.ui.http.DHtmlLayoutServlet.process(DHtmlLayoutServlet.java:215)
org.zkoss.zk.ui.http.DHtmlLayoutServlet.doGet(DHtmlLayoutServlet.java:140)
javax.servlet.http.HttpServlet.service(HttpServlet.java:626)
javax.servlet.http.HttpServlet.service(HttpServlet.java:733)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)

java.lang.NullPointerException
java.base/java.util.Objects.requireNonNull(Objects.java:221)
java.logging/java.util.logging.Logger.addHandler(Logger.java:2060)
xx.xx.xx.util.ApplicationLogger.log(ApplicationLogger.java:118)
xx.xx.xx.composers.LoginComposer.<clinit>(LoginComposer.java:115)
java.base/java.lang.Class.forName0(Native Method)
java.base/java.lang.Class.forName(Class.java:398)
org.zkoss.lang.Classes.forNameByThread(Classes.java:274)
org.zkoss.lang.ImportedClassResolver.resolveClass(ImportedClassResolver.java:129)
org.zkoss.zk.ui.impl.PageImpl.resolveClass(PageImpl.java:575)
org.zkoss.zk.ui.impl.AbstractUiFactory.newComposer(AbstractUiFactory.java:184)
org.zkoss.zk.ui.impl.Utils.newComposer(Utils.java:91)
org.zkoss.zk.ui.metainfo.ComponentInfo.toComposer(ComponentInfo.java:360)
org.zkoss.zk.ui.metainfo.ComponentInfo.toComposers(ComponentInfo.java:330)
org.zkoss.zk.ui.metainfo.ComponentInfo.resolveComposer(ComponentInfo.java:318)
org.zkoss.zk.ui.impl.UiEngineImpl.execCreateChild0(UiEngineImpl.java:901)
org.zkoss.zk.ui.impl.UiEngineImpl.execCreateChild(UiEngineImpl.java:894)
org.zkoss.zk.ui.impl.UiEngineImpl.execCreate0(UiEngineImpl.java:781)
org.zkoss.zk.ui.impl.UiEngineImpl.execCreateChild(UiEngineImpl.java:841)
org.zkoss.zk.ui.impl.UiEngineImpl.execCreate0(UiEngineImpl.java:799)
org.zkoss.zk.ui.impl.UiEngineImpl.execCreate(UiEngineImpl.java:745)
org.zkoss.zk.ui.impl.UiEngineImpl.execNewPage0(UiEngineImpl.java:466)
org.zkoss.zk.ui.impl.UiEngineImpl.execNewPage(UiEngineImpl.java:374)
org.zkoss.zk.ui.http.DHtmlLayoutServlet.process(DHtmlLayoutServlet.java:215)
org.zkoss.zk.ui.http.DHtmlLayoutServlet.doGet(DHtmlLayoutServlet.java:140)
javax.servlet.http.HttpServlet.service(HttpServlet.java:626)
javax.servlet.http.HttpServlet.service(HttpServlet.java:733)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)

根本原因

java.lang.ExceptionInInitializerError
java.base/java.lang.Class.forName0(Native Method)
java.base/java.lang.Class.forName(Class.java:398)
org.zkoss.lang.Classes.forNameByThread(Classes.java:274)
org.zkoss.lang.ImportedClassResolver.resolveClass(ImportedClassResolver.java:129)
org.zkoss.zk.ui.impl.PageImpl.resolveClass(PageImpl.java:575)
org.zkoss.zk.ui.impl.AbstractUiFactory.newComposer(AbstractUiFactory.java:184)
org.zkoss.zk.ui.impl.Utils.newComposer(Utils.java:91)
org.zkoss.zk.ui.metainfo.ComponentInfo.toComposer(ComponentInfo.java:360)
org.zkoss.zk.ui.metainfo.ComponentInfo.toComposers(ComponentInfo.java:330)
org.zkoss.zk.ui.metainfo.ComponentInfo.resolveComposer(ComponentInfo.java:318)
org.zkoss.zk.ui.impl.UiEngineImpl.execCreateChild0(UiEngineImpl.java:901)
org.zkoss.zk.ui.impl.UiEngineImpl.execCreateChild(UiEngineImpl.java:894)
org.zkoss.zk.ui.impl.UiEngineImpl.execCreate0(UiEngineImpl.java:781)
org.zkoss.zk.ui.impl.UiEngineImpl.execCreateChild(UiEngineImpl.java:841)
org.zkoss.zk.ui.impl.UiEngineImpl.execCreate0(UiEngineImpl.java:799)
org.zkoss.zk.ui.impl.UiEngineImpl.execCreate(UiEngineImpl.java:745)
org.zkoss.zk.ui.impl.UiEngineImpl.execNewPage0(UiEngineImpl.java:466)
org.zkoss.zk.ui.impl.UiEngineImpl.execNewPage(UiEngineImpl.java:374)
org.zkoss.zk.ui.http.DHtmlLayoutServlet.process(DHtmlLayoutServlet.java:215)
org.zkoss.zk.ui.http.DHtmlLayoutServlet.doGet(DHtmlLayoutServlet.java:140)
javax.servlet.http.HttpServlet.service(HttpServlet.java:626)
javax.servlet.http.HttpServlet.service(HttpServlet.java:733)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)

java.lang.NullPointerException
java.base/java.util.Objects.requireNonNull(Objects.java:221)
java.logging/java.util.logging.Logger.addHandler(Logger.java:2060)
xx.xx.xx.util.ApplicationLogger.log(ApplicationLogger.java:118)
xx.xx.xx.composers.LoginComposer.<clinit>(LoginComposer.java:115)
java.base/java.lang.Class.forName0(Native Method)
java.base/java.lang.Class.forName(Class.java:398)
org.zkoss.lang.Classes.forNameByThread(Classes.java:274)
org.zkoss.lang.ImportedClassResolver.resolveClass(ImportedClassResolver.java:129)
org.zkoss.zk.ui.impl.PageImpl.resolveClass(PageImpl.java:575)
org.zkoss.zk.ui.impl.AbstractUiFactory.newComposer(AbstractUiFactory.java:184)
org.zkoss.zk.ui.impl.Utils.newComposer(Utils.java:91)
org.zkoss.zk.ui.metainfo.ComponentInfo.toComposer(ComponentInfo.java:360)
org.zkoss.zk.ui.metainfo.ComponentInfo.toComposers(ComponentInfo.java:330)
org.zkoss.zk.ui.metainfo.ComponentInfo.resolveComposer(ComponentInfo.java:318)
org.zkoss.zk.ui.impl.UiEngineImpl.execCreateChild0(UiEngineImpl.java:901)
org.zkoss.zk.ui.impl.UiEngineImpl.execCreateChild(UiEngineImpl.java:894)
org.zkoss.zk.ui.impl.UiEngineImpl.execCreate0(UiEngineImpl.java:781)
org.zkoss.zk.ui.impl.UiEngineImpl.execCreateChild(UiEngineImpl.java:841)
org.zkoss.zk.ui.impl.UiEngineImpl.execCreate0(UiEngineImpl.java:799)
org.zkoss.zk.ui.impl.UiEngineImpl.execCreate(UiEngineImpl.java:745)
org.zkoss.zk.ui.impl.UiEngineImpl.execNewPage0(UiEngineImpl.java:466)
org.zkoss.zk.ui.impl.UiEngineImpl.execNewPage(UiEngineImpl.java:374)
org.zkoss.zk.ui.http.DHtmlLayoutServlet.process(DHtmlLayoutServlet.java:215)
org.zkoss.zk.ui.http.DHtmlLayoutServlet.doGet(DHtmlLayoutServlet.java:140)
javax.servlet.http.HttpServlet.service(HttpServlet.java:626)
javax.servlet.http.HttpServlet.service(HttpServlet.java:733)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)

这就是我在
LoginComposer.java

logger.addHandler(fileHandler);

ApplicationLogger.log(Level.INFO, PROPERTIES.getProperty("LOG_HEADER"),className);

ApplicationLogger.java

public class ApplicationLogger {

  private static ApplicationLogger applicationLogger;
  private static Logger logger;
  private static final SimpleFormatter simpleFormatter = new SimpleFormatter();
  private static final Properties PROPERTIES = new Properties();
  private static final String PROPERTIES_FILE = "application-masterconfig.properties";
  private static FileHandler fileHandler;

  private ApplicationLogger() {

}

  static {
    try {

      // Get context ClassLoader for this thread.
      final ClassLoader classLoader = Thread.currentThread().getContextClassLoader();

      // InputStream for reading the properties file.
      InputStream inputStream = classLoader.getResourceAsStream(PROPERTIES_FILE);

      // Read the property list
      PROPERTIES.load(inputStream);

      // Initialize the file handler. true ensures append mode.
      fileHandler = new FileHandler(PROPERTIES.getProperty("PATH_TO_APPLICATION_LOGS_DEVELOPMENT"), true);

      // This Formatter will be used to format LogRecords for this Handler.
      fileHandler.setFormatter(simpleFormatter);

    } catch(SecurityException securityException) {
      securityException.printStackTrace();
    } catch(IOException ioException) {
      ioException.printStackTrace();
    } finally {

}
  }

  public static ApplicationLogger getNewInstance() {
    if (Objects.isNull(applicationLogger)) {
      return new ApplicationLogger();
    }
    return applicationLogger;
  }

  public static void log(final Level level, final String msg, final String canonicalClassName) {
    logger = Logger.getLogger(canonicalClassName);
    logger.addHandler(fileHandler);
    logger.setUseParentHandlers(false); // No need to write at console.
    logger.log(level, msg); // Log the message
  }
}

public class LoginComposer extends GenericForwardComposer < Component > {
...
...
...
...
static {
    try {

      final ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
      InputStream inputStream = classLoader.getResourceAsStream(PROPERTIES_FILE);
      PROPERTIES.load(inputStream);

      /**
             * <p>
             * Log the message indicating the appication has started and the login page has
             * loaded.
             */
      ApplicationLogger.log(Level.INFO, PROPERTIES.getProperty("LOG_HEADER"), className);
    } catch(SecurityException securityException) {
      ApplicationLogger.log(Level.INFO, PROPERTIES.getProperty("SECURITY_VIOLATION_EXCEPTION_HEADER"), className);
      PRINT_WRITER = new PrintWriter(STRING_WRITER);
      securityException.printStackTrace(PRINT_WRITER);
      ApplicationLogger.log(Level.SEVERE, STRING_WRITER.toString(), className);
    } catch(IOException ioException) {
      ApplicationLogger.log(Level.INFO, PROPERTIES.getProperty("IOEXCEPTION_HEADER"), className);
      PRINT_WRITER = new PrintWriter(STRING_WRITER);
      ioException.printStackTrace(PRINT_WRITER);
      ApplicationLogger.log(Level.SEVERE, STRING_WRITER.toString(), className);
    }
  }
  ......
}

LoginComposer.java

public class ApplicationLogger {

  private static ApplicationLogger applicationLogger;
  private static Logger logger;
  private static final SimpleFormatter simpleFormatter = new SimpleFormatter();
  private static final Properties PROPERTIES = new Properties();
  private static final String PROPERTIES_FILE = "application-masterconfig.properties";
  private static FileHandler fileHandler;

  private ApplicationLogger() {

}

  static {
    try {

      // Get context ClassLoader for this thread.
      final ClassLoader classLoader = Thread.currentThread().getContextClassLoader();

      // InputStream for reading the properties file.
      InputStream inputStream = classLoader.getResourceAsStream(PROPERTIES_FILE);

      // Read the property list
      PROPERTIES.load(inputStream);

      // Initialize the file handler. true ensures append mode.
      fileHandler = new FileHandler(PROPERTIES.getProperty("PATH_TO_APPLICATION_LOGS_DEVELOPMENT"), true);

      // This Formatter will be used to format LogRecords for this Handler.
      fileHandler.setFormatter(simpleFormatter);

    } catch(SecurityException securityException) {
      securityException.printStackTrace();
    } catch(IOException ioException) {
      ioException.printStackTrace();
    } finally {

}
  }

  public static ApplicationLogger getNewInstance() {
    if (Objects.isNull(applicationLogger)) {
      return new ApplicationLogger();
    }
    return applicationLogger;
  }

  public static void log(final Level level, final String msg, final String canonicalClassName) {
    logger = Logger.getLogger(canonicalClassName);
    logger.addHandler(fileHandler);
    logger.setUseParentHandlers(false); // No need to write at console.
    logger.log(level, msg); // Log the message
  }
}

public class LoginComposer extends GenericForwardComposer < Component > {
...
...
...
...
static {
    try {

      final ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
      InputStream inputStream = classLoader.getResourceAsStream(PROPERTIES_FILE);
      PROPERTIES.load(inputStream);

      /**
             * <p>
             * Log the message indicating the appication has started and the login page has
             * loaded.
             */
      ApplicationLogger.log(Level.INFO, PROPERTIES.getProperty("LOG_HEADER"), className);
    } catch(SecurityException securityException) {
      ApplicationLogger.log(Level.INFO, PROPERTIES.getProperty("SECURITY_VIOLATION_EXCEPTION_HEADER"), className);
      PRINT_WRITER = new PrintWriter(STRING_WRITER);
      securityException.printStackTrace(PRINT_WRITER);
      ApplicationLogger.log(Level.SEVERE, STRING_WRITER.toString(), className);
    } catch(IOException ioException) {
      ApplicationLogger.log(Level.INFO, PROPERTIES.getProperty("IOEXCEPTION_HEADER"), className);
      PRINT_WRITER = new PrintWriter(STRING_WRITER);
      ioException.printStackTrace(PRINT_WRITER);
      ApplicationLogger.log(Level.SEVERE, STRING_WRITER.toString(), className);
    }
  }
  ......
}

公共类LoginComposer扩展了GenericForwardComposer{
...
...
...
...
静止的{
试一试{
final ClassLoader ClassLoader=Thread.currentThread（）.getContextClassLoader（）；
InputStream InputStream=classLoader.getResourceAsStream（属性文件）；
属性。加载（inputStream）；
/**
*
*记录指示应用程序已启动且登录页面已关闭的消息
*上膛了。
*/
ApplicationLogger.log（Level.INFO，PROPERTIES.getProperty（“日志头”），className）；
}捕获（SecurityException SecurityException）{
ApplicationLogger.log（Level.INFO，PROPERTIES.getProperty（“安全性\违规\异常\头”），类名）；
PRINT_WRITER=新的PrintWriter（字符串编写器）；
securityException.printStackTrace（打印写入程序）；
ApplicationLogger.log（Level.SEVERE，STRING\u WRITER.toString（），className）；
}捕获（IOException IOException）{
ApplicationLogger.log（Level.INFO，PROPERTIES.getProperty（“IOEXCEPTION_头”），className）；
PRINT_WRITER=新的PrintWriter（字符串编写器）；
ioException.printStackTrace（打印写入程序）；
ApplicationLogger.log（Level.SEVERE，STRING\u WRITER.toString（），className）；
}
}
......
}

请问如何解决这个问题？非常感谢您的帮助。
我认为您的静态构造函数失败，因此fileHandler仍然为空。当静态构造函数依赖于尚不可用的东西时，或者当您具有循环依赖时，通常会发生这种情况

在静态构造函数中读取文件通常无法正常工作。我多次遇到同样的问题。最后，我停止在JavaEE应用程序中使用静态构造函数

您可以在第一次使用类时（例如，在getNewInstance（）内部）按需初始化该类，而不是使用静态构造函数。
我认为您的静态构造函数失败，因此fileHandler保持为空。当静态构造函数依赖于尚不可用的东西时，或者当您具有循环依赖时，通常会发生这种情况

在静态构造函数中读取文件通常无法正常工作。我多次遇到同样的问题。最后，我停止在JavaEE应用程序中使用静态构造函数

您可以在第一次使用类时（例如，在getNewInstance（）内部）按需初始化该类，而不是使用静态构造函数