Fixing findbugs warnings after plugin pom upgrade

src/findbugs/excludesFilter.xml

@@ -1,6 +1,9 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <FindBugsFilter>
     <Match>
-        <Package name="org.jenkinsci.plugins.pipeline.utility.steps.shaded"/>
+        <Package name="~org\.jenkinsci\.plugins\.pipeline\.utility\.steps\.shaded.*"/>
+    </Match>
+    <Match>
+        <Class name="~.*\.Messages"/>
     </Match>
 </FindBugsFilter>

src/main/java/org/jenkinsci/plugins/pipeline/utility/steps/conf/ReadPropertiesStepExecution.java

@@ -49,6 +49,7 @@
  * @author Robert Sandell <rsandell@cloudbees.com>.
  */
 public class ReadPropertiesStepExecution extends AbstractFileOrTextStepExecution<Map<String, Object>> {
+    private static final long serialVersionUID = 1L;
 
     private transient ReadPropertiesStep step;
 

src/main/java/org/jenkinsci/plugins/pipeline/utility/steps/conf/WriteYamlStep.java

@@ -139,6 +139,7 @@ public String getDisplayName() {
     }
 
     public static class Execution extends SynchronousNonBlockingStepExecution<Void> {
+        private static final long serialVersionUID = 1L;
 
         private transient WriteYamlStep step;
 

src/main/java/org/jenkinsci/plugins/pipeline/utility/steps/conf/mf/ReadManifestStepExecution.java

@@ -50,6 +50,7 @@
  * @author Robert Sandell <rsandell@cloudbees.com>.
  */
 public class ReadManifestStepExecution extends AbstractFileOrTextStepExecution<SimpleManifest> {
+    private static final long serialVersionUID = 1L;
 
     private transient ReadManifestStep step;
 

src/main/java/org/jenkinsci/plugins/pipeline/utility/steps/fs/FileSha1Step.java

@@ -120,7 +120,7 @@ protected String run() throws Exception {
             return filePath.act(new ComputeSha1());
         }
 
-        private class ComputeSha1 extends MasterToSlaveFileCallable<String> {
+        private static class ComputeSha1 extends MasterToSlaveFileCallable<String> {
             @Override
             public String invoke(File file, VirtualChannel virtualChannel) throws IOException, InterruptedException {
                 if (file.exists() && file.isFile()) {

src/main/java/org/jenkinsci/plugins/pipeline/utility/steps/fs/FindFilesStepExecution.java

@@ -42,6 +42,7 @@
  * @author Robert Sandell <rsandell@cloudbees.com>.
  */
 public class FindFilesStepExecution extends SynchronousNonBlockingStepExecution<FileWrapper[]> {
+    private static final long serialVersionUID = 1L;
 
     @Inject
     private transient FindFilesStep step;

src/main/java/org/jenkinsci/plugins/pipeline/utility/steps/fs/TeeStep.java

@@ -108,7 +108,9 @@ public OutputStream decorateLogger(Run build, final OutputStream logger) throws
     private static OutputStream append(FilePath fp) throws IOException, InterruptedException {
         if (fp.getChannel() == null) {
             File f = new File(fp.getRemote()).getAbsoluteFile();
-            f.getParentFile().mkdirs();
+            if (!f.getParentFile().exists() && !f.getParentFile().mkdirs()) {
+                throw new IOException("Failed to create directory " + f.getParentFile());
+            }
             try {
                 return Files.newOutputStream(f.toPath(), StandardOpenOption.CREATE, StandardOpenOption.APPEND/*, StandardOpenOption.DSYNC*/);
             } catch (InvalidPathException e) {
@@ -120,7 +122,9 @@ private static OutputStream append(FilePath fp) throws IOException, InterruptedE
                 @Override
                 public OutputStream invoke(File f, VirtualChannel channel) throws IOException, InterruptedException {
                     f = f.getAbsoluteFile();
-                    f.getParentFile().mkdirs();
+                    if (!f.getParentFile().exists() && !f.getParentFile().mkdirs()) {
+                        throw new IOException("Failed to create directory " + f.getParentFile());
+                    }
                     try {
                         return new RemoteOutputStream(Files.newOutputStream(f.toPath(), StandardOpenOption.CREATE, StandardOpenOption.APPEND/*, StandardOpenOption.DSYNC*/));
                     } catch (InvalidPathException e) {

src/main/java/org/jenkinsci/plugins/pipeline/utility/steps/fs/TouchStep.java

@@ -134,6 +134,7 @@ public FormValidation doCheckFile(@QueryParameter String value) {
      * The execution of {@link TouchStep}.
      */
     public static class ExecutionImpl extends SynchronousNonBlockingStepExecution<FileWrapper> {
+        private static final long serialVersionUID = 1L;
 
         private transient TouchStep step;
 

src/main/java/org/jenkinsci/plugins/pipeline/utility/steps/json/ReadJSONStepExecution.java

@@ -46,6 +46,7 @@
  * @author Nikolas Falco
  */
 public class ReadJSONStepExecution extends AbstractFileOrTextStepExecution<JSON> {
+    private static final long serialVersionUID = 1L;
 
     private transient ReadJSONStep step;
 

src/main/java/org/jenkinsci/plugins/pipeline/utility/steps/json/WriteJSONStepExecution.java

@@ -47,6 +47,7 @@
  * @author Nikolas Falco
  */
 public class WriteJSONStepExecution extends SynchronousNonBlockingStepExecution<Void> {
+    private static final long serialVersionUID = 1L;
 
     private transient WriteJSONStep step;
 

src/main/java/org/jenkinsci/plugins/pipeline/utility/steps/maven/ReadMavenPomStep.java

@@ -122,6 +122,7 @@ public String getDisplayName() {
     }
 
     public static class Execution extends SynchronousNonBlockingStepExecution<Model> {
+        private static final long serialVersionUID = 1L;
 
         private transient ReadMavenPomStep step;
 

src/main/java/org/jenkinsci/plugins/pipeline/utility/steps/maven/WriteMavenPomStep.java

@@ -119,6 +119,7 @@ public String getDisplayName() {
     }
 
     public static class Execution extends SynchronousNonBlockingStepExecution<Void> {
+        private static final long serialVersionUID = 1L;
 
         private transient WriteMavenPomStep step;
 

src/main/java/org/jenkinsci/plugins/pipeline/utility/steps/zip/UnZipStepExecution.java

@@ -59,6 +59,7 @@
  * @author Robert Sandell <rsandell@cloudbees.com>.
  */
 public class UnZipStepExecution extends SynchronousNonBlockingStepExecution<Object> {
+    private static final long serialVersionUID = 1L;
 
     private transient UnZipStep step;
 

src/main/java/org/jenkinsci/plugins/pipeline/utility/steps/zip/ZipStepExecution.java

@@ -56,6 +56,7 @@
  * @author Robert Sandell <rsandell@cloudbees.com>.
  */
 public class ZipStepExecution extends SynchronousNonBlockingStepExecution<Void> {
+    private static final long serialVersionUID = 1L;
 
     private transient ZipStep step;