Kill orphan Blender process after rendering

src/main/java/com/sheepit/client/Client.java

@@ -534,7 +534,7 @@ import okhttp3.HttpUrl;
 			
 			if (this.renderingJob.getProcessRender().getProcess() != null) {
 				this.renderingJob.setAskForRendererKill(true);
-				OS.getOS().kill(this.renderingJob.getProcessRender().getProcess());
+				this.renderingJob.getProcessRender().kill();
 			}
 		}
 

src/main/java/com/sheepit/client/Job.java

@@ -123,7 +123,7 @@ import java.util.regex.Pattern;
 		setUserBlockJob(true);
 		RenderProcess process = getProcessRender();
 		if (process != null) {
-			OS.getOS().kill(process.getProcess());
+			process.kill();
 		}
 	}
 	
@@ -374,8 +374,8 @@ import java.util.regex.Pattern;
 							long duration = (new Date().getTime() - process.getStartTime()) / 1000; // in seconds
 							if (configuration.getMaxRenderTime() > 0 && duration > configuration.getMaxRenderTime()) {
 								setAskForRendererKill(true);
-								log.debug("Killing render because process duration");
-								OS.getOS().kill(process.getProcess());
+								log.debug("Killing render - exceeding allowed process duration");
+								process.kill();
 							}
 						}
 					}
@@ -455,7 +455,6 @@ import java.util.regex.Pattern;
 					if (configuration.getMaxAllowedMemory() != -1 && getProcessRender().getMemoryUsed().get() > configuration.getMaxAllowedMemory()) {
 						log.debug("Blocking render because process ram used (" + getProcessRender().getMemoryUsed().get() + "k) is over user setting (" + configuration
 								.getMaxAllowedMemory() + "k)");
-						OS.getOS().kill(process.getProcess());
 						process.finish();
 						if (process.getRenderDuration() == -1) {
 							if (timeStamp == null) {
@@ -498,6 +497,7 @@ import java.util.regex.Pattern;
 						
 						// Put back base icon
 						gui.updateTrayIcon(Job.SHOW_BASE_ICON);
+						process.kill();
 						for (String logline : configuration.filesystemHealthCheck()) {
 							log.debug(logline);
 						}
@@ -549,6 +549,7 @@ import java.util.regex.Pattern;
 			gui.updateTrayIcon(Job.SHOW_BASE_ICON);
 
 			log.debug("end of rendering");
+			
 		}
 		catch (Exception err) {
 			if (script_file != null) {

src/main/java/com/sheepit/client/RenderProcess.java

@@ -19,6 +19,7 @@
 
 package com.sheepit.client;
 
+import com.sheepit.client.os.OS;
 import lombok.Data;
 
 import java.util.Date;
@@ -92,7 +93,19 @@ import oshi.software.os.OSProcess;
 		return 0;
 	}
 	
+	public void kill() {
+		if (process != null){
+			try {
+				OS.getOS().kill(process);
+				log.debug("RenderProcess::Process killed");
+			} catch (NullPointerException ex) { // We are racing the system itself, we can't avoid catching NPE's
+				log.debug("RenderProcess::Handled process becoming unavailable before getting killed");
+			}
+		}
+	}
+	
 	public void finish() {
+		kill();
 		endTime = new Date().getTime();
 		osProcess = null;
 		process = null;

src/main/java/com/sheepit/client/Server.java

@@ -156,7 +156,7 @@ public class Server extends Thread {
 									
 									if (this.client.getRenderingJob().getProcessRender().getProcess() != null) {
 										this.client.getRenderingJob().setAskForRendererKill(true);
-										OS.getOS().kill(this.client.getRenderingJob().getProcessRender().getProcess());
+										this.client.getRenderingJob().getProcessRender().kill();
 									}
 								}
 							}