Protect from race condition in Triggers

[FIXED JENKINS-29790] [FIXED JENKINS-29945]

core/src/main/java/hudson/triggers/SCMTrigger.java

@@ -2,6 +2,7 @@
  * The MIT License
  * 
  * Copyright (c) 2004-2009, Sun Microsystems, Inc., Kohsuke Kawaguchi, Brian Westrich, Jean-Baptiste Quenot, id:cactusman
+ *               2015 Kanstantsin Shautsou
  * 
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
@@ -24,6 +25,7 @@
 package hudson.triggers;
 
 import antlr.ANTLRException;
+import com.google.common.base.Preconditions;
 import hudson.Extension;
 import hudson.Util;
 import hudson.console.AnnotatedLargeText;
@@ -117,6 +119,10 @@ public class SCMTrigger extends Trigger<Item> {
 
     @Override
     public void run() {
+        if (job == null) {
+            return;
+        }
+
         run(null);
     }
 
@@ -128,6 +134,10 @@ public class SCMTrigger extends Trigger<Item> {
      * @since 1.375
      */
     public void run(Action[] additionalActions) {
+        if (job == null) {
+            return;
+        }
+
         DescriptorImpl d = getDescriptor();
 
         LOGGER.fine("Scheduling a polling for "+job);
@@ -152,6 +162,10 @@ public class SCMTrigger extends Trigger<Item> {
 
     @Override
     public Collection<? extends Action> getProjectActions() {
+        if (job == null) {
+            return Collections.emptyList();
+        }
+
         return Collections.singleton(new SCMAction());
     }
 
@@ -457,10 +471,12 @@ public class SCMTrigger extends Trigger<Item> {
         private Action[] additionalActions;
 
         public Runner() {
-            additionalActions = new Action[0];
+            this(null);
         }
         
         public Runner(Action[] actions) {
+            Preconditions.checkNotNull(job, "Runner can't be instantiated when job is null");
+
             if (actions == null) {
                 additionalActions = new Action[0];
             } else {
@@ -532,6 +548,10 @@ public class SCMTrigger extends Trigger<Item> {
         }
 
         public void run() {
+            if (job == null) {
+                return;
+            }
+
             String threadName = Thread.currentThread().getName();
             Thread.currentThread().setName("SCM polling for "+job);
             try {

core/src/main/java/hudson/triggers/TimerTrigger.java

@@ -2,6 +2,7 @@
  * The MIT License
  * 
  * Copyright (c) 2004-2009, Sun Microsystems, Inc., Kohsuke Kawaguchi, Jean-Baptiste Quenot, Martin Eigenbrodt
+ *               2015 Kanstantsin Shautsou
  * 
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
@@ -52,6 +53,10 @@ public class TimerTrigger extends Trigger<BuildableItem> {
 
     @Override
     public void run() {
+        if (job == null) {
+            return;
+        }
+
         job.scheduleBuild(0, new TimerTriggerCause());
     }
 

core/src/main/java/hudson/triggers/Trigger.java

@@ -2,7 +2,8 @@
  * The MIT License
  * 
  * Copyright (c) 2004-2009, Sun Microsystems, Inc., Kohsuke Kawaguchi, Brian Westrich, Jean-Baptiste Quenot, Stephen Connolly, Tom Huybrechts
- * 
+ *               2015 Kanstantsin Shautsou
+ *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
  * in the Software without restriction, including without limitation the rights
@@ -149,6 +150,7 @@ public abstract class Trigger<J extends Item> implements Describable<Trigger<?>>
 
     protected final String spec;
     protected transient CronTabList tabs;
+    @CheckForNull
     protected transient J job;
 
     /**

core/src/test/java/hudson/triggers/SCMTriggerTest.java

+/*
+ * The MIT License
+ *
+ * Copyright (c) 2015 Kanstantsin Shautsou
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+package hudson.triggers;
+
+import org.junit.Test;
+import org.jvnet.hudson.test.Issue;
+
+/**
+ * @author Kanstantsin Shautsou
+ */
+public class SCMTriggerTest {
+    @Issue({"JENKINS-29790", "JENKINS-29945"})
+    @Test
+    public void testNoNPE() throws Exception {
+        final SCMTrigger scmTrigger = new SCMTrigger("");
+        
+        scmTrigger.run();
+        scmTrigger.run(null);
+        scmTrigger.getProjectActions();
+    }
+}

core/src/test/java/hudson/triggers/TimerTriggerTest.java

+/*
+ * The MIT License
+ *
+ * Copyright (c) 2015 Kanstantsin Shautsou
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+package hudson.triggers;
+
+import antlr.ANTLRException;
+import org.junit.Test;
+import org.jvnet.hudson.test.Issue;
+
+/**
+ * @author Kanstantsin Shautsou
+ */
+public class TimerTriggerTest {
+    @Issue("JENKINS-29790")
+    @Test
+    public void testNoNPE() throws ANTLRException {
+        new TimerTrigger("").run();
+    }
+}