Improve ProjectException error messages

compiler/ballerina-lang/src/main/java/io/ballerina/projects/directory/BuildProject.java

@@ -254,7 +254,7 @@ public DocumentId documentId(Path file) {
                 }
             }
         }
-        throw new ProjectException("provided path does not belong to the project");
+        throw new ProjectException("'" + file.toString() + "' does not belong to the current project");
     }
 
     private boolean isFilePathInProject(Path filepath) {

compiler/ballerina-lang/src/main/java/io/ballerina/projects/directory/ProjectLoader.java

@@ -92,7 +92,7 @@ public static Project loadProject(Path path, ProjectEnvironmentBuilder projectEn
         }
 
         if (!ProjectPaths.isBalFile(absFilePath)) {
-            throw new ProjectException("provided path is not a valid Ballerina source file");
+            throw new ProjectException("'" + absFilePath + "' is not a valid Ballerina source file");
         }
 
         try {

compiler/ballerina-lang/src/main/java/io/ballerina/projects/directory/SingleFileProject.java

@@ -105,7 +105,7 @@ public Project duplicate() {
     public DocumentId documentId(Path file) {
         if (!this.sourceRoot.toAbsolutePath().normalize().toString().equals(
                 file.toAbsolutePath().normalize().toString())) {
-            throw new ProjectException("provided path does not belong to the project");
+            throw new ProjectException("'" + file + "' does not belong to the current project");
         }
         return this.currentPackage().getDefaultModule().documentIds().iterator().next();
     }

compiler/ballerina-lang/src/main/java/io/ballerina/projects/internal/ProjectFiles.java

@@ -367,7 +367,7 @@ public static void validateBuildProjectDirPath(Path projectDirPath) {
         }
 
         if (ProjectUtils.findProjectRoot(projectDirPath.toAbsolutePath().getParent()) != null) {
-            throw new ProjectException("Provided path is already within a Ballerina package: " + projectDirPath);
+            throw new ProjectException("'" + projectDirPath + "' is already within a Ballerina package");
         }
 
         checkReadPermission(projectDirPath);

compiler/ballerina-lang/src/main/java/io/ballerina/projects/util/ProjectPaths.java

@@ -45,7 +45,7 @@ public class ProjectPaths {
     public static Path packageRoot(Path filepath) throws ProjectException {
         // check if the file exists
         if (!Files.exists(filepath)) {
-            throw new ProjectException("provided path does not exist:" + filepath);
+            throw new ProjectException("'" + filepath + "'" + " does not exist");
         }
 
         if (Files.isDirectory(filepath)) {
@@ -62,7 +62,7 @@ public static Path packageRoot(Path filepath) throws ProjectException {
 
         // check if the file is a regular file
         if (!Files.isRegularFile(filepath)) {
-            throw new ProjectException("provided path is not a regular file: " + filepath);
+            throw new ProjectException("'" + filepath + "'" + " is not a regular file");
         }
 
         // Check if the file is inside a Ballerina package directory
@@ -79,7 +79,7 @@ public static Path packageRoot(Path filepath) throws ProjectException {
             }
 
             if (!isBalFile(filepath)) {
-                throw new ProjectException("provided path is not a valid Ballerina source file: " + filepath);
+                throw new ProjectException("'" + filepath + "' is not a valid Ballerina source file");
             }
 
             // check if the file is a source file in the default module

project-api/project-api-test/src/test/java/io/ballerina/projects/test/TestBuildProject.java

@@ -464,8 +464,7 @@ public void testLoadBallerinaProjectInProject() {
             TestUtils.loadBuildProject(projectPath);
             Assert.fail("expected an invalid project exception");
         } catch (ProjectException e) {
-            Assert.assertTrue(e.getMessage().contains("Provided path is already within a Ballerina package: " +
-                    projectPath));
+            Assert.assertEquals(e.getMessage(), "'" + projectPath + "' is already within a Ballerina package");
         }
     }
 
@@ -838,7 +837,7 @@ public void testAccessNonExistingDocument() {
             DocumentId oldDocumentId = buildProject.documentId(filePath); // get the document ID
             Assert.fail();
         } catch (ProjectException e) {
-            Assert.assertTrue(e.getMessage().contains("provided path does not belong to the project"));
+            Assert.assertTrue(e.getMessage().contains("'" + filePath + "' does not belong to the current project"));
         }
     }
 

project-api/project-api-test/src/test/java/io/ballerina/projects/test/TestUnknownTypeProject.java

@@ -333,7 +333,8 @@ public void testLoadBalaProjectByNonBalFile() {
             project = TestUtils.loadProject(projectPath);
             Assert.fail("project loading with a non-bal file is expected to fail");
         } catch (Exception e) {
-            Assert.assertTrue(e.getMessage().contains("provided path is not a valid Ballerina source file"));
+            Assert.assertEquals(e.getMessage(), "'" + projectPath.toAbsolutePath() +
+                    "' is not a valid Ballerina source file");
         }
     }