This tool is designed to diagnose errors by tailing the log file. It is a stand alone java application with less memory footprint.

1. Java 8
2. IDE (Inteillj - not necessary )
3. Maven
4. WSO2 IS Server

1.Json Simple

Apache.Commons.Tailor implmentation used to tail the log file. It uses file channel to read the data from the log file and load the data into byte buffer.

Since it implements TailerListener, it handles all the log lines and separate all the ERROR log lines from INFO log lines.

Interpreter first validates the log line ,then it analyses the log line and find what error occured ,later it triggers respective action executors to diagnose the error and finally it triggers post action executors to do post actions.

Classes which extend Action executor abstract class can be used as ActionExecutors. Execute function with parameter Folder path (which contains of the folder path where action execution results sholud store) used to do diagnosis. ActionExecutors can use root(RegexNode) for configuration purpose.

Currently ZipFileExecutor is the only one post action executor which used to file the diagnostics reults folder.

Regex Tree is built up in tool start up phase. It used as a static memory. Json file configuration is given below.

• User can extend the tree by adding nodes by giving proper regex as path.
• User can add one or more diagnostic action executors to both leaf nodes and non leaf nodes.
• User can add one or more regex pattern as path between parent node and child node.
• User can add ActionExecutors.

• Clone the project
• Go to DiagnosticsTool/org.wso2.carbon.diagnostics.application/resources
• Open the RegexTree.json file in any text editor
• Edit LogFileConfiguration by providing wso2carbon.log file path and wso2carbon.pid file path
• Build the project using mvn clean install
• Go to DiagnosticsTool/org.wso2.carbon.diagnostics.application/target
• run jar file