better handling of the logs

scheduling-abstraction-layer/src/main/java/org/activeeon/morphemic/service/ByonAgentAutomation.java

@@ -48,7 +48,7 @@ public class ByonAgentAutomation {
             LOGGER.info("Running the script on the BYON node ");
             sshConnection.executeSSHCommand(SCRIPT_DIR, false);
         } catch (JSchException | InterruptedException e) {
-            LOGGER.error("An error while preparing the node: \n " + e.getStackTrace());
+            LOGGER.error("An error while preparing the node: ", e);
         }
     }
 
@@ -63,10 +63,10 @@ public class ByonAgentAutomation {
                 sshConnection.executeSSHCommand("sudo chown " + username + ":" + username + " " + logFile, logFileFlag);
 
             } catch (JSchException | InterruptedException e) {
-                LOGGER.error("An error while creating the log file: \n" + e.getStackTrace());
+                LOGGER.error("An error while creating the log file: " , e);
             } finally {
                 logFileFlag = true;
-                LOGGER.info("Byon SSH logs are saved at: " + logFile);
+                LOGGER.info("Byon SSH logs are saved at: {}", logFile);
             }
         }
     }
@@ -82,8 +82,7 @@ public class ByonAgentAutomation {
                 scriptURL = DEBIAN_SCRIPT;
                 break;
             default:
-                LOGGER.error("The Operating System \"" + os + "\" does not support automated configuration," +
-                        " the installation of ProActive node agent should be done manually");
+                LOGGER.error("The Operating System \"{}\" does not support automated configuration, the installation of ProActive node agent should be done manually", os);
                 throw new IllegalArgumentException("The OS does not support automated configuration");
                 // code block
         }

scheduling-abstraction-layer/src/main/java/org/activeeon/morphemic/service/SSHConnection.java

@@ -48,7 +48,7 @@ public class SSHConnection {
 
             channel = (ChannelExec) session.openChannel("exec");
             channel.setCommand(command);
-            LOGGER.info("Executing on " + host + ": " + command);
+            LOGGER.info("Executing on {}: {}", host, command);
             ByteArrayOutputStream responseStream = new ByteArrayOutputStream();
             channel.setOutputStream(responseStream, true);
             channel.setErrStream(responseStream, true);
@@ -58,14 +58,14 @@ public class SSHConnection {
                 Thread.sleep(100);
             }
             if (channel.getExitStatus() != 0) {
-                LOGGER.error("An error occurred while executing the command, please check the logfile: " + logFile);
+                LOGGER.error("An error occurred while executing the command, please check the logfile: {}", logFile);
             }
             String responseString = new String(responseStream.toByteArray());
             if (!responseString.equals("")) {
-                LOGGER.info("The Output of the command is: \n" + responseString);
+                LOGGER.info("The Output of the command is: {}", responseString);
             }
         } catch (JSchException | InterruptedException e) {
-            LOGGER.error("An error occurred while Executing an SSH command on " + host);
+            LOGGER.error("An error occurred while Executing an SSH command on {}", host);
             throw e;
         } finally {
             if (session != null) {