[Java] Clarify that copy will go out of range when dealing with a character array. Issue aeron-io#448.

Author: mjpt777

sbe-tool/src/main/java/uk/co/real_logic/sbe/generation/java/JavaGenerator.java

@@ -1649,7 +1649,7 @@ private CharSequence generatePrimitiveArrayPropertyDecode(
  indent + " if (dstOffset < 0 || dstOffset > (dst.length - length))\n" +
  indent + " {\n" +
  indent + " throw new IndexOutOfBoundsException(" +
- "\"dstOffset out of range for copy: offset=\" + dstOffset);\n" +
+ "\"Copy will go out of range: offset=\" + dstOffset);\n" +
  indent + " }\n\n" +
  "%s" +
  indent + " buffer.getBytes(this.offset + %d, dst, dstOffset, length);\n\n" +
@@ -1742,7 +1742,7 @@ private CharSequence generatePrimitiveArrayPropertyEncode(
  indent + " if (srcOffset < 0 || srcOffset > (src.length - length))\n" +
  indent + " {\n" +
  indent + " throw new IndexOutOfBoundsException(" +
- "\"srcOffset out of range for copy: offset=\" + srcOffset);\n" +
+ "\"Copy will go out of range: offset=\" + srcOffset);\n" +
  indent + " }\n\n" +
  indent + " buffer.putBytes(this.offset + %d, src, srcOffset, length);\n\n" +
  indent + " return this;\n" +