added a logback converter that prints only product-specific exception traces and skips all the framework ones.

base-exceptions/src/main/java/com/telecominfraproject/wlan/server/exceptions/logback/ExceptionCompressingConverter.java

@@ -0,0 +1,60 @@
+package com.telecominfraproject.wlan.server.exceptions.logback;
+
+import ch.qos.logback.classic.pattern.ClassicConverter;
+import ch.qos.logback.classic.spi.ILoggingEvent;
+import ch.qos.logback.classic.spi.IThrowableProxy;
+import ch.qos.logback.classic.spi.StackTraceElementProxy;
+
+/**
+ * @author dtop
+ *
+ * Example of logback.xml:
+ <configuration>
+
+  <conversionRule conversionWord="filteredStack" 
+                  converterClass="com.telecominfraproject.wlan.server.exceptions.logback.ExceptionCompressingConverter" />
+        
+  <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+    <encoder>
+      <pattern> [%thread] - %msg%n%filteredStack%nopex</pattern>
+    </encoder>
+  </appender>
+
+  <root level="DEBUG">
+    <appender-ref ref="STDOUT" />
+  </root>
+</configuration>
+ */
+public class ExceptionCompressingConverter extends ClassicConverter {
+
+	@Override
+	public String convert(ILoggingEvent event) {
+
+		StringBuilder strb = new StringBuilder(256);
+		
+		IThrowableProxy itp = event.getThrowableProxy();
+		if(itp!=null) {
+			strb.append(itp.getClassName()).append(": ").append(itp.getMessage()).append('\n');
+			
+			StackTraceElementProxy[] stepArr = itp.getStackTraceElementProxyArray();
+			String stackTraceClassName;
+			if(stepArr!=null) {
+				for(StackTraceElementProxy step: stepArr) {
+					stackTraceClassName = step.getStackTraceElement().getClassName();
+					if(stackTraceClassName.startsWith("com.telecominfraproject.wlan")) {
+						if(!(stackTraceClassName.contains("$$FastClassBySpringCGLIB$$") ||								
+								stackTraceClassName.contains("$$EnhancerBySpringCGLIB$$") ||
+								stackTraceClassName.contains("ServletFilters$1") ||
+								stackTraceClassName.contains("StaticCorsFilter") 								
+								)) {
+							strb.append(step.getSTEAsString()).append('\n');
+						}
+					}
+				}
+			}
+		}
+		
+		return strb.toString();
+	}
+
+}