[CSV-201] Do not use RuntimeException in CSVParser.iterator().new

Iterator() {...}.getNextRecord(). Use an IllegalStateException instead
(KISS for now, no need for a custom exception)

src/changes/changes.xml

@@ -43,6 +43,7 @@
       <action issue="CSV-193" type="fix" dev="ggregory" due-to="Matthias Wiehl">Fix incorrect method name 'withFirstRowAsHeader' in user guide.</action>
       <action issue="CSV-171" type="fix" dev="ggregory" due-to="Gary Gregory, Michael Graessle, Adrian Bridgett">Negative numeric values in the first column are always quoted in minimal mode.</action>
       <action issue="CSV-187" type="update" dev="ggregory" due-to="Gary Gregory">Update platform requirement from Java 6 to 7.</action>
+      <action issue="CSV-201" type="update" dev="ggregory" due-to="Benedikt Ritter, Gary Gregory">Do not use RuntimeException in CSVParser.iterator().new Iterator() {...}.getNextRecord()</action>
       <action issue="CSV-189" type="add" dev="ggregory" due-to="Peter Holzwarth, Gary Gregory">CSVParser: Add factory method accepting InputStream.</action>
       <action issue="CSV-190" type="add" dev="ggregory" due-to="Gary Gregory">Add convenience API CSVFormat.print(File, Charset)</action>
       <action issue="CSV-191" type="add" dev="ggregory" due-to="Gary Gregory">Add convenience API CSVFormat.print(Path, Charset)</action>

src/main/java/org/apache/commons/csv/CSVParser.java

@@ -501,10 +501,14 @@ public final class CSVParser implements Iterable<CSVRecord>, Closeable {
     /**
      * Returns an iterator on the records.
      *
-     * <p>IOExceptions occurring during the iteration are wrapped in a
-     * RuntimeException.
-     * If the parser is closed a call to {@code next()} will throw a
-     * NoSuchElementException.</p>
+     * <p>
+     * An {@link IOException} caught during the iteration are re-thrown as an
+     * {@link IllegalStateException}.
+     * </p>
+     * <p>
+     * If the parser is closed a call to {@link Iterator#next()} will throw a
+     * {@link NoSuchElementException}.
+     * </p>
      */
     @Override
     public Iterator<CSVRecord> iterator() {
@@ -515,8 +519,8 @@ public final class CSVParser implements Iterable<CSVRecord>, Closeable {
                 try {
                     return CSVParser.this.nextRecord();
                 } catch (final IOException e) {
-                    // TODO: This is not great, throw an ISE instead?
-                    throw new RuntimeException(e);
+                    throw new IllegalStateException(
+                            e.getClass().getSimpleName() + " reading next record: " + e.toString(), e);
                 }
             }