本文整理了Java中freemarker.log.Logger.warn()方法的一些代码示例，展示了Logger.warn()的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。Logger.warn()方法的具体详情如下：
包路径：freemarker.log.Logger
类名称：Logger
方法名：warn

Logger.warn介绍

[英]Logs a warning message.
[中]记录一条警告消息。

代码示例

代码示例来源：origin: org.freemarker/freemarker

/**
 * Logs flag warning for a limited number of times. This is used to prevent
 * log flooding.
 */
static void logFlagWarning(String message) {
  if (!flagWarningsEnabled) return;
  
  int cnt;
  synchronized (flagWarningsCntSync) {
    cnt = flagWarningsCnt;
    if (cnt < MAX_FLAG_WARNINGS_LOGGED) {
      flagWarningsCnt++;
    } else {
      flagWarningsEnabled = false;
      return;
    }
  }
  message += " This will be an error in some later FreeMarker version!";
  if (cnt + 1 == MAX_FLAG_WARNINGS_LOGGED) {
    message += " [Will not log more regular expression flag problems until restart!]";
  }
  LOG.warn(message);
}

代码示例来源：origin: org.freemarker/freemarker

private static ClassLoader tryGetThreadContextClassLoader() {
  ClassLoader tccl;
  try {
    tccl = Thread.currentThread().getContextClassLoader();
  } catch (SecurityException e) {
    // Suppress
    tccl = null;
    LOG.warn("Can't access Thread Context ClassLoader", e);
  }
  return tccl;
}

代码示例来源：origin: org.freemarker/freemarker

public void unreferenced() {
  try {
    UnicastRemoteObject.unexportObject(this, false);
  } catch (NoSuchObjectException e) {
    LOG.warn("Failed to unexport RMI debugger listener", e);
  }
}

代码示例来源：origin: org.freemarker/freemarker

public void report(TemplateException te, Environment env) {
  String message = "Error executing FreeMarker template part in the #attempt block";
  if (!logAsWarn) {
    LOG.error(message, te);
  } else {
    LOG.warn(message, te);
  }
}

代码示例来源：origin: org.freemarker/freemarker

TldParserForTaglibBuilding(ObjectWrapper wrapper) {
  if (wrapper instanceof BeansWrapper) {
    beansWrapper = (BeansWrapper) wrapper;
  } else {
    beansWrapper = null;
    if (LOG.isWarnEnabled()) {
      LOG.warn("Custom EL functions won't be loaded because "
          + (wrapper == null
              ? "no ObjectWrapper was specified for the TaglibFactory "
                  + "(via TaglibFactory.setObjectWrapper(...), exists since 2.3.22)"
              : "the ObjectWrapper wasn't instance of " + BeansWrapper.class.getName())
          + ".");
    }
  }
}

代码示例来源：origin: org.freemarker/freemarker

public static Integer getSystemProperty(final String key, final int defValue) {
    try {
      return (Integer) AccessController.doPrivileged(
        new PrivilegedAction()
        {
          public Object run() {
            return Integer.getInteger(key, defValue);
          }
        });
    } catch (AccessControlException e) {
      LOG.warn("Insufficient permissions to read system property " + 
          StringUtil.jQuote(key) + ", using default value " + defValue);
      return Integer.valueOf(defValue);
    }
  }
}

代码示例来源：origin: org.freemarker/freemarker

public void run() {
  try {
    ObjectOutputStream out = new ObjectOutputStream(s.getOutputStream());
    ObjectInputStream in = new ObjectInputStream(s.getInputStream());
    byte[] challenge = new byte[512];
    R.nextBytes(challenge);
    out.writeInt(220); // protocol version
    out.writeObject(challenge);
    MessageDigest md = MessageDigest.getInstance("SHA");
    md.update(password);
    md.update(challenge);
    byte[] response = (byte[]) in.readObject();
    if (Arrays.equals(response, md.digest())) {
      out.writeObject(debuggerStub);
    } else {
      out.writeObject(null);
    }
  } catch (Exception e) {
    LOG.warn("Connection to " + s.getInetAddress().getHostAddress() + " abruply broke", e);
  }
}

代码示例来源：origin: org.freemarker/freemarker

private void endEvaluation() throws JspException {
  if (needPop) {
    pageContext.popWriter();
    needPop = false;
  }
  if (tag.doEndTag() == Tag.SKIP_PAGE) {
    LOG.warn("Tag.SKIP_PAGE was ignored from a " + tag.getClass().getName() + " tag.");
  }
}

代码示例来源：origin: org.freemarker/freemarker

private static ExpressionFactory findExpressionFactoryImplementation() {
  ExpressionFactory ef = tryExpressionFactoryImplementation("com.sun");
  if (ef == null) {
    ef = tryExpressionFactoryImplementation("org.apache");
    if (ef == null) {
      LOG.warn("Could not find any implementation for " + 
          ExpressionFactory.class.getName());
    }
  }
  return ef;
}

代码示例来源：origin: org.freemarker/freemarker

@SuppressFBWarnings(value={ "MSF_MUTABLE_SERVLET_FIELD", "DC_DOUBLECHECK" }, justification="Performance trick")
private void logWarnOnObjectWrapperMismatch() {
  // Deliberately uses double check locking.
  if (wrapper != config.getObjectWrapper() && !objectWrapperMismatchWarnLogged && LOG.isWarnEnabled()) {
    final boolean logWarn;
    synchronized (this) {
      logWarn = !objectWrapperMismatchWarnLogged;
      if (logWarn) {
        objectWrapperMismatchWarnLogged = true;
      }
    }
    if (logWarn) {
      LOG.warn(
          this.getClass().getName()
          + ".wrapper != config.getObjectWrapper(); possibly the result of incorrect extension of "
          + FreemarkerServlet.class.getName() + ".");
    }
  }
}

代码示例来源：origin: org.freemarker/freemarker

public static String getSystemProperty(final String key, final String defValue) {
  try {
    return (String) AccessController.doPrivileged(
      new PrivilegedAction()
      {
        public Object run() {
          return System.getProperty(key, defValue);
        }
      });
  } catch (AccessControlException e) {
    LOG.warn("Insufficient permissions to read system property " + 
        StringUtil.jQuoteNoXSS(key) + ", using default value " +
        StringUtil.jQuoteNoXSS(defValue));
    return defValue;
  }
}

代码示例来源：origin: org.freemarker/freemarker

private static ExpressionFactory tryExpressionFactoryImplementation(String packagePrefix) {
  String className = packagePrefix + ".el.ExpressionFactoryImpl";
  try {
    Class cl = ClassUtil.forName(className);
    if (ExpressionFactory.class.isAssignableFrom(cl)) {
      LOG.info("Using " + className + " as implementation of " + 
          ExpressionFactory.class.getName());
      return (ExpressionFactory) cl.newInstance();
    }
    LOG.warn("Class " + className + " does not implement " + 
        ExpressionFactory.class.getName());
  } catch (ClassNotFoundException e) {
  } catch (Exception e) {
    LOG.error("Failed to instantiate " + className, e);
  }
  return null;
}

代码示例来源：origin: org.freemarker/freemarker

private void addConstructorsToClassIntrospectionData(final Map<Object, Object> introspData,
    Class<?> clazz) {
  try {
    Constructor<?>[] ctors = clazz.getConstructors();
    if (ctors.length == 1) {
      Constructor<?> ctor = ctors[0];
      introspData.put(CONSTRUCTORS_KEY, new SimpleMethod(ctor, ctor.getParameterTypes()));
    } else if (ctors.length > 1) {
      OverloadedMethods overloadedCtors = new OverloadedMethods(bugfixed);
      for (int i = 0; i < ctors.length; i++) {
        overloadedCtors.addConstructor(ctors[i]);
      }
      introspData.put(CONSTRUCTORS_KEY, overloadedCtors);
    }
  } catch (SecurityException e) {
    LOG.warn("Can't discover constructors for class " + clazz.getName(), e);
  }
}

代码示例来源：origin: org.freemarker/freemarker

private static TemplateLoader createDefaultTemplateLoader(
    Version incompatibleImprovements, TemplateLoader existingTemplateLoader) {
  if (incompatibleImprovements.intValue() < _TemplateAPI.VERSION_INT_2_3_21) {
    if (existingTemplateLoader instanceof LegacyDefaultFileTemplateLoader) {
      return existingTemplateLoader;
    }
    try {
      return new LegacyDefaultFileTemplateLoader();
    } catch (Exception e) {
      CACHE_LOG.warn("Couldn't create legacy default TemplateLoader which accesses the current directory. "
          + "(Use new Configuration(Configuration.VERSION_2_3_21) or higher to avoid this.)", e);
      return null;
    }
  } else {
    return null;
  }
}

代码示例来源：origin: org.freemarker/freemarker

public Object findTemplateSource(String name) throws IOException {
  String fullPath = subdirPath + name;
  if (attemptFileAccess) {
    // First try to open as plain file (to bypass servlet container resource caches).
    try {
      String realPath = servletContext.getRealPath(fullPath);
      if (realPath != null) {
        File file = new File(realPath);
        if (file.canRead() && file.isFile()) {
          return file;
        }
      }
    } catch (SecurityException e) {
      ;// ignore
    }
  }
  // If it fails, try to open it with servletContext.getResource.
  URL url = null;
  try {
    url = servletContext.getResource(fullPath);
  } catch (MalformedURLException e) {
    LOG.warn("Could not retrieve resource " + StringUtil.jQuoteNoXSS(fullPath),
        e);
    return null;
  }
  return url == null ? null : new URLTemplateSource(url, getURLConnectionUsesCaches());
}

代码示例来源：origin: org.freemarker/freemarker

/**
 * Creates a {@link Map} with the content as described for the return value of {@link #get(Class)}.
 */
private Map<Object, Object> createClassIntrospectionData(Class<?> clazz) {
  final Map<Object, Object> introspData = new HashMap<Object, Object>();
  if (exposeFields) {
    addFieldsToClassIntrospectionData(introspData, clazz);
  }
  final Map<MethodSignature, List<Method>> accessibleMethods = discoverAccessibleMethods(clazz);
  addGenericGetToClassIntrospectionData(introspData, accessibleMethods);
  if (exposureLevel != BeansWrapper.EXPOSE_NOTHING) {
    try {
      addBeanInfoToClassIntrospectionData(introspData, clazz, accessibleMethods);
    } catch (IntrospectionException e) {
      LOG.warn("Couldn't properly perform introspection for class " + clazz, e);
      introspData.clear(); // FIXME NBC: Don't drop everything here.
    }
  }
  addConstructorsToClassIntrospectionData(introspData, clazz);
  if (introspData.size() > 1) {
    return introspData;
  } else if (introspData.size() == 0) {
    return Collections.emptyMap();
  } else { // map.size() == 1
    Entry<Object, Object> e = introspData.entrySet().iterator().next();
    return Collections.singletonMap(e.getKey(), e.getValue());
  }
}

代码示例来源：origin: org.freemarker/freemarker

private static void logInLogger(boolean error, String message, Throwable exception) {
  boolean canUseRealLogger;
  synchronized (Logger.class) {
    canUseRealLogger = loggerFactory != null && !(loggerFactory instanceof _NullLoggerFactory);
  }
  if (canUseRealLogger) {
    try {
      final Logger logger = Logger.getLogger("freemarker.logger");
      if (error) {
        logger.error(message);
      } else {
        logger.warn(message);
      }
    } catch (Throwable e) {
      canUseRealLogger = false;
    }
  }
  if (!canUseRealLogger) {
    System.err.println((error ? "ERROR" : "WARN") + " "
        + LoggerFactory.class.getName() + ": " + message);
    if (exception != null) {
      System.err.println("\tException: " + tryToString(exception));
      while (exception.getCause() != null) {
        exception = exception.getCause();
        System.err.println("\tCaused by: " + tryToString(exception));
      }
    }
  }
}

代码示例来源：origin: org.freemarker/freemarker

private void addListener(EventListener listener) {
  boolean added = false;
  if (listener instanceof ServletContextAttributeListener) {
    addListener(servletContextAttributeListeners, listener);
    added = true;
  }
  if (listener instanceof ServletContextListener) {
    addListener(servletContextListeners, listener);
    added = true;
  }
  if (listener instanceof HttpSessionAttributeListener) {
    addListener(httpSessionAttributeListeners, listener);
    added = true;
  }
  if (listener instanceof HttpSessionListener) {
    addListener(httpSessionListeners, listener);
    added = true;
  }
  if (!added) {
    LOG.warn(
      "Listener of class " + listener.getClass().getName() +
      "wasn't registered as it doesn't implement any of the " +
      "recognized listener interfaces.");
  }
}

代码示例来源：origin: org.freemarker/freemarker

private void addTldLocationsFromFileDirectory(final File dir) throws IOException, SAXException {
  if (dir.isDirectory()) {
    if (LOG.isDebugEnabled()) {
      LOG.debug("Scanning for *.tld-s in File directory: " + StringUtil.jQuoteNoXSS(dir));
    }
    File[] tldFiles = dir.listFiles(new FilenameFilter() {

      public boolean accept(File urlAsFile, String name) {
        return isTldFileNameIgnoreCase(name);
      }

    });
    if (tldFiles == null) {
      throw new IOException("Can't list this directory for some reason: " + dir);
    }
    for (int i = 0; i < tldFiles.length; i++) {
      final File file = tldFiles[i];
      addTldLocationFromTld(new FileTldLocation(file));
    }
  } else {
    LOG.warn("Skipped scanning for *.tld for non-existent directory: " + StringUtil.jQuoteNoXSS(dir));
  }
}

代码示例来源：origin: org.freemarker/freemarker

} catch (IOException e) {
  if (LOG.isWarnEnabled()) {
    LOG.warn("Ignored classpath TLD location " + StringUtil.jQuoteNoXSS(tldResourcePath)
        + " because of error", e);