Revert "removing unused class"

This reverts commit 2722b7f7d1.

java/src/processing/mode/java/preproc/PdePreprocessIssueException.java

@@ -0,0 +1,32 @@
+package processing.mode.java.preproc;
+
+
+import processing.mode.java.preproc.PdePreprocessIssue;
+
+/**
+ * Exception indicating that a preprocessor issue was found.
+ */
+public class PdePreprocessIssueException extends RuntimeException {
+
+  private final PdePreprocessIssue preprocessIssue;
+
+  /**
+   * Create a new exception indicating that there was a preprocessing issue.
+   *
+   * @param newPreprocessIssue Issue encountered.
+   */
+  public PdePreprocessIssueException(PdePreprocessIssue newPreprocessIssue) {
+    super(newPreprocessIssue.getMsg());
+    preprocessIssue = newPreprocessIssue;
+  }
+
+  /**
+   * Get information about the preprocessing issue found.
+   *
+   * @return Record of the preprocessor issue.
+   */
+  public PdePreprocessIssue getIssue() {
+    return preprocessIssue;
+  }
+
+}