fixed NullPointerException in Logger class triggered by empty message

1 files changed, 22 insertions, 9 deletions

diff --git a/common/src/main/java/at/gv/egovernment/moa/logging/Logger.java b/common/src/main/java/at/gv/egovernment/moa/logging/Logger.java
index 265ad026d..7cb2e7daf 100644
--- a/common/src/main/java/at/gv/egovernment/moa/logging/Logger.java
+++ b/common/src/main/java/at/gv/egovernment/moa/logging/Logger.java
@@ -79,6 +79,19 @@ public class Logger {
   }
   
   /**
+   * Prepare the message for printing it as string.
+   * <p>Mainly introduce because the <code>message</code> might be <code>null</code>. 
+   *
+   * @param message the message
+   * @return the string
+   */
+  private static String prepareMessage(Object message) {
+      if(null == message)
+          return "no message given";
+      return message.toString();
+  }
+  
+  /**
    * Test, if the trace log level is enabled.
    * 
    * @return boolean <code>true</code>, if tracing output is enabled
@@ -108,7 +121,7 @@ public class Logger {
    */
   public static void trace(Object message) {
 		org.slf4j.Logger logger = getLogger();
-		logger.trace(message.toString());
+		logger.trace(prepareMessage(message));
   }
   
   /**
@@ -141,17 +154,17 @@ public class Logger {
    */
   public static void debug(Object message) {
 		org.slf4j.Logger logger = getLogger();
-		logger.debug(message.toString());
+		logger.debug(prepareMessage(message));
   }
-  
-  /**
+
+/**
    * Log an info message.
    * 
    * @param message The message to log.
    */
   public static void info(Object message) {
 		org.slf4j.Logger logger = getLogger();
-		logger.info(message.toString());
+		logger.info(prepareMessage(message));
   }
   
   /**
@@ -161,7 +174,7 @@ public class Logger {
    */
   public static void warn(Object message) {
 		org.slf4j.Logger logger = getLogger();
-		logger.warn(message.toString());
+		logger.warn(prepareMessage(message));
   }
 
   /**
@@ -172,7 +185,7 @@ public class Logger {
    */
   public static void warn(Object message, Throwable t) {
 		org.slf4j.Logger logger = getLogger();
-		logger.warn(message.toString(), t);
+		logger.warn(prepareMessage(message), t);
   }
   
   /**
@@ -182,7 +195,7 @@ public class Logger {
    */
   public static void error(Object message) {
 		org.slf4j.Logger logger = getLogger();
-		logger.error(message.toString());
+		logger.error(prepareMessage(message));
   }
 
   /**
@@ -193,7 +206,7 @@ public class Logger {
    */
   public static void error(Object message, Throwable t) {
 		org.slf4j.Logger logger = getLogger();
-		logger.error(message.toString(), t);
+		logger.error(prepareMessage(message), t);
   }
   
   /**