Enhance error handling for tasks

src/main/groovy/io/openliberty/tools/gradle/tasks/AbstractServerTask.groovy

@@ -208,6 +208,20 @@ abstract class AbstractServerTask extends AbstractLibertyTask {
         }
     }
 
+    // Use this method to copy over the server.xml file from the defaultServer template.
+    // Returns true if the server.xml file does not exist and the defaultServer template server.xml file is copied over, false otherwise.
+    protected boolean copyDefaultServerTemplate(File installDir, File serverDir) {
+        File serverXmlFile = new File(serverDir, "server.xml")
+        if (!serverXmlFile.exists()) {
+            File defaultServerTemplate = new File(installDir, "templates/servers/defaultServer/server.xml")
+            if (defaultServerTemplate.exists()) {
+                Files.copy(defaultServerTemplate.toPath(), serverXmlFile.toPath(), StandardCopyOption.REPLACE_EXISTING)
+                return true;
+            }
+        }
+        return false;
+    }
+
     protected void copyConfigDirectory() {
         //merge default server.env with one in config directory
         File configDirServerEnv = new File(server.configDirectory, "server.env")

src/main/groovy/io/openliberty/tools/gradle/tasks/CreateTask.groovy

@@ -1,5 +1,5 @@
 /**
- * (C) Copyright IBM Corporation 2014, 2022.
+ * (C) Copyright IBM Corporation 2014, 2023.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -33,7 +33,7 @@ class CreateTask extends AbstractServerTask {
             group 'Liberty'
         })
         outputs.upToDateWhen {
-            getServerDir(project).exists() && new File(getServerDir(project), 'server.xml')
+            getServerDir(project).exists() && (new File(getServerDir(project), 'server.xml')).exists()
         }
     }
 
@@ -76,7 +76,9 @@ class CreateTask extends AbstractServerTask {
     void create() {
         //Checking etc/server.env for outputDirs
         Liberty.checkEtcServerEnvProperties(project)
-        if(!getServerDir(project).exists()){
+        File serverDir = getServerDir(project)
+        File serverXmlFile = new File(serverDir, "server.xml")
+        if(!serverDir.exists()){
             def params = buildLibertyMap(project);
             if (server.template != null && server.template.length() != 0) {
                 params.put('template', server.template)
@@ -85,6 +87,10 @@ class CreateTask extends AbstractServerTask {
                 params.put('noPassword', server.noPassword)
             }
             executeServerCommand(project, 'create', params)
+        } else if (copyDefaultServerTemplate(getInstallDir(project), serverDir)) {
+            // copied defaultServer template server.xml over for rare case that the server.xml disappears from an existing Liberty server (issue 850)
+            // if the project contains its own server.xml file, it will get copied over in copyConfigFiles() next
+            logger.warn("The " + serverXmlFile.getAbsolutePath() + " does not exist. Copying over the defaultServer template server.xml file.")
         }
         copyConfigFiles()
         writeServerPropertiesToXml(project)

src/main/groovy/io/openliberty/tools/gradle/tasks/RunTask.groovy

@@ -1,5 +1,5 @@
 /**
- * (C) Copyright IBM Corporation 2014, 2019.
+ * (C) Copyright IBM Corporation 2014, 2023.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -32,10 +32,19 @@ class RunTask extends AbstractServerTask {
     void run() {
         addShutdownHook {
             if (isLibertyInstalledAndValid(project)) {
-                if (getServerDir(project).exists()) {
-                    ServerTask serverTaskStop = createServerTask(project, "stop");
-                    serverTaskStop.setUseEmbeddedServer(server.embedded)
-                    serverTaskStop.execute()
+                File serverDir = getServerDir(project)
+                if (serverDir.exists()) {
+                    // copy default server template server.xml file over if the server.xml file does not exist so that the server can be stopped
+                    boolean defaultServerTemplateUsed = copyDefaultServerTemplate(getInstallDir(project), serverDir)                    
+                    File serverXmlFile = new File(getServerDir(project),"server.xml")
+                    if (serverXmlFile.exists()) {
+                        ServerTask serverTaskStop = createServerTask(project, "stop");
+                        serverTaskStop.setUseEmbeddedServer(server.embedded)
+                        serverTaskStop.execute()
+                    }
+                    if (defaultServerTemplateUsed) {
+                        serverXmlFile.delete() // delete the temporary copy of the server.xml file
+                    }                
                 }
             }
         }
@@ -58,6 +67,6 @@ class RunTask extends AbstractServerTask {
             run_process.inputStream.eachLine {
                 println it
             }
-        }
+        }                
     }
 }

src/main/groovy/io/openliberty/tools/gradle/tasks/StatusTask.groovy

@@ -1,5 +1,5 @@
 /**
- * (C) Copyright IBM Corporation 2014, 2019.
+ * (C) Copyright IBM Corporation 2014, 2023.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -29,9 +29,23 @@ class StatusTask extends AbstractServerTask {
 
     @TaskAction
     void status() {
-        def status_process = new ProcessBuilder(buildCommand("status")).redirectErrorStream(true).start()
-        status_process.inputStream.eachLine {
-            println it
+        if (isLibertyInstalledAndValid(project)) {
+            File serverDir = getServerDir(project)
+            if (serverDir.exists()) {
+                File serverXmlFile = new File(serverDir,"server.xml")
+                if (serverXmlFile.exists()) {
+                    def status_process = new ProcessBuilder(buildCommand("status")).redirectErrorStream(true).start()
+                    status_process.inputStream.eachLine {
+                        println it
+                    }
+                } else {
+        	        logger.error ('The server status cannot be checked. There is no server.xml file in the server.')
+                }
+            } else {
+        	    logger.error ('The server status cannot be checked. The server has not been created.')
+            }
+        } else {
+            logger.error ('The server status cannot be checked. The runtime has not been installed.')
         }
     }
 

src/main/groovy/io/openliberty/tools/gradle/tasks/StopTask.groovy

@@ -1,5 +1,5 @@
 /**
- * (C) Copyright IBM Corporation 2014, 2020.
+ * (C) Copyright IBM Corporation 2014, 2023.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -31,12 +31,26 @@ class StopTask extends AbstractServerTask {
     @TaskAction
     void stop() {
         if (isLibertyInstalledAndValid(project)) {
-            if (getServerDir(project).exists()) {
-                ServerTask serverTaskStop = createServerTask(project, "stop");
-                serverTaskStop.setUseEmbeddedServer(server.embedded)
-                serverTaskStop.execute()
+            File serverDir = getServerDir(project)
+            if (serverDir.exists()) {
+                File serverXmlFile = new File(serverDir,"server.xml")
+                boolean defaultServerTemplateUsed = copyDefaultServerTemplate(getInstallDir(project),serverDir)
+                if (serverXmlFile.exists()) {
+                    ServerTask serverTaskStop = createServerTask(project, "stop");
+                    serverTaskStop.setUseEmbeddedServer(server.embedded)
+                    serverTaskStop.execute()
+                } else {
+        	        logger.error ('The server cannot be stopped. There is no server.xml file in the server.')
+                }
+
+                if (defaultServerTemplateUsed) {
+        	        logger.warn ('The server.xml file was missing in the server during the stop task. Copied the defaultServer template server.xml file into the server temporarily so the stop task could be completed.')
+                    if (!serverXmlFile.delete()) {
+                        logger.error('Could not delete the server.xml file copied from the defaultServer template after stopping the server.')
+                    }
+                }
             } else {
-        	logger.error ('There is no server to stop. The server has not been created.')
+        	    logger.error ('There is no server to stop. The server has not been created.')
             }
         } else {
             logger.error ('There is no server to stop. The runtime has not been installed.')

src/test/groovy/io/openliberty/tools/gradle/LibertyTest.groovy

@@ -28,6 +28,7 @@ class LibertyTest extends AbstractIntegrationTest{
     static File resourceDir = new File("build/resources/test/liberty-test")
     static File buildDir = new File(integTestDir, "/liberty-test")
     static String buildFilename = "build.gradle"
+    static File serverXmlFile = new File(buildDir, "/build/wlp/usr/servers/LibertyProjectServer/server.xml")
 
     @BeforeClass
     public static void setup() {
@@ -180,10 +181,30 @@ class LibertyTest extends AbstractIntegrationTest{
            throw new AssertionError ("Fail on task libertyStart after second clean.", e)
         }
 
+        // try deleting the server.xml and see if we can recover
+        assert serverXmlFile.exists() : 'server.xml file does not exist in LibertyProjectServer'
+        assert serverXmlFile.delete() : 'server.xml could not be deleted in LibertyProjectServer'
+
         try{
            runTasks(buildDir, 'libertyStop')
         } catch (Exception e) {
-           throw new AssertionError ("Fail on task libertyStop after libertyStart.", e)
+           throw new AssertionError ("Fail on task libertyStop after deleting server.xml.", e)
+        }
+
+        assert !serverXmlFile.exists() : 'server.xml file unexpectedly exists in LibertyProjectServer after libertyStop'
+
+        try{
+            runTasks(buildDir, 'libertyStatus')
+        } catch (Exception e) {
+            throw new AssertionError ("Fail on task libertyStatus after deleting server.xml.", e)
+        }
+
+        assert serverXmlFile.exists() : 'server.xml file does not exist in LibertyProjectServer after libertyStatus'
+
+        try{
+            runTasks(buildDir, 'clean')
+        } catch (Exception e) {
+            throw new AssertionError ("Fail on task clean after deleting server.xml.", e)
         }
     }