UPdated the FormvalidationUtil to get matlabroot in correct way.

Author: nbhoski

src/main/java/com/mathworks/ci/FormValidationUtil.java

@@ -16,14 +16,12 @@
 public class FormValidationUtil {
 
     public static FormValidation getFirstErrorOrWarning(
-            List<Function<String, FormValidation>> validations) {
+            List<Function<String, FormValidation>> validations, String validationArg) {
         if (validations == null || validations.isEmpty())
             return FormValidation.ok();
         try {
-            String matlabRoot = Jenkins.getInstance()
-                    .getDescriptorByType(UseMatlabVersionDescriptor.class).getMatlabRootFolder();
             for (Function<String, FormValidation> val : validations) {
-                FormValidation validationResult = val.apply(matlabRoot);
+                FormValidation validationResult = val.apply(validationArg);
                 if (validationResult.kind.compareTo(Kind.ERROR) == 0
                         || validationResult.kind.compareTo(Kind.WARNING) == 0) {
                     return validationResult;
@@ -34,4 +32,16 @@ public static FormValidation getFirstErrorOrWarning(
         }
         return FormValidation.ok();
     }
+    
+    //Method to get the MATLAB root from build wrapper class.
+    
+    public static String getMatlabRoot() {
+        try {
+            return Jenkins.getInstance().getDescriptorByType(UseMatlabVersionDescriptor.class)
+                    .getMatlabRootFolder();
+        } catch (Exception e) {
+            // For any exception during getMatlabRootFolder() operation, return matlabRoot as NULL.
+            return null;
+        }
+    }
 }

src/main/java/com/mathworks/ci/RunMatlabTestsBuilder.java

@@ -163,7 +163,7 @@ public FormValidation doCheckCoberturaChkBx(@QueryParameter boolean coberturaChk
             if (coberturaChkBx) {
                 listOfCheckMethods.add(chkCoberturaSupport);
             }
-            return FormValidationUtil.getFirstErrorOrWarning(listOfCheckMethods);
+            return FormValidationUtil.getFirstErrorOrWarning(listOfCheckMethods,FormValidationUtil.getMatlabRoot());
         }
 
         Function<String, FormValidation> chkCoberturaSupport = (String matlabRoot) -> {
@@ -191,7 +191,7 @@ public FormValidation doCheckModelCoverageChkBx(@QueryParameter boolean modelCov
             if (modelCoverageChkBx) {
                 listOfCheckMethods.add(chkModelCoverageSupport);
             }
-            return FormValidationUtil.getFirstErrorOrWarning(listOfCheckMethods);
+            return FormValidationUtil.getFirstErrorOrWarning(listOfCheckMethods,FormValidationUtil.getMatlabRoot());
         }
 
         Function<String, FormValidation> chkModelCoverageSupport = (String matlabRoot) -> {
@@ -219,7 +219,7 @@ public FormValidation doCheckStmResultsChkBx(@QueryParameter boolean stmResultsC
             if (stmResultsChkBx) {
                 listOfCheckMethods.add(chkSTMResultsSupport);
             }
-            return FormValidationUtil.getFirstErrorOrWarning(listOfCheckMethods);
+            return FormValidationUtil.getFirstErrorOrWarning(listOfCheckMethods,FormValidationUtil.getMatlabRoot());
         }
 
         Function<String, FormValidation> chkSTMResultsSupport = (String matlabRoot) -> {

src/main/java/com/mathworks/ci/UseMatlabVersionBuildWrapper.java

@@ -93,7 +93,7 @@ public FormValidation doCheckMatlabRootFolder(@QueryParameter String matlabRootF
             listOfCheckMethods.add(chkMatlabEmpty);
             listOfCheckMethods.add(chkMatlabSupportsRunTests);
 
-            return FormValidationUtil.getFirstErrorOrWarning(listOfCheckMethods);
+            return FormValidationUtil.getFirstErrorOrWarning(listOfCheckMethods,matlabRootFolder);
         }
 
         Function<String, FormValidation> chkMatlabEmpty = (String matlabRootFolder) -> {