[shrinkwrap-issues] [JBoss JIRA] (SHRINKWRAP-461) SeekableInMemoryByteChannel returns incorrect value for EOF
Andrew Rubinger (JIRA)
jira-events at lists.jboss.org
Fri Jul 12 18:03:21 EDT 2013
[ https://issues.jboss.org/browse/SHRINKWRAP-461?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Andrew Rubinger updated SHRINKWRAP-461:
---------------------------------------
Git Pull Request: https://github.com/shrinkwrap/shrinkwrap/pull/76
> SeekableInMemoryByteChannel returns incorrect value for EOF
> -----------------------------------------------------------
>
> Key: SHRINKWRAP-461
> URL: https://issues.jboss.org/browse/SHRINKWRAP-461
> Project: ShrinkWrap
> Issue Type: Bug
> Components: api
> Affects Versions: 1.1.2
> Environment: Window 7, Java 7
> Reporter: Resurgam Immortius
> Assignee: Andrew Rubinger
> Fix For: 1.1.3
>
>
> The NIO2 API's SeekableInMemoryByteChannel currently returns 0 when a read requests data either at the end of the data or past the end of the data.
> The API for SeekableByteChannel ( http://docs.oracle.com/javase/7/docs/api/java/nio/channels/SeekableByteChannel.html#read(java.nio.ByteBuffer) ) states the return value should be -1 if EOF has been reached. This behavior is confirmed through testing of FileChannelImpl.
> Java's sun.nio.cs.StreamDecoder.readBytes() expects this behavior, throwing an IOException if zero bytes are read.
> I encountered this issue using GSON to write and then read a json file from a ShrinkWrap archive as part of a unit test. At the end of reading a json file, GSON checks that the EOF has been reached, and at this point a read returns 0 and causes an exception in sun.nio.cs.StreamDecoder.readBytes().
> A unit test showing the issue:
> {code:java}
> @Test
> public void test() throws IOException {
> JavaArchive homeArchive = ShrinkWrap.create(JavaArchive.class);
> FileSystem vfs = ShrinkWrapFileSystems.newFileSystem(homeArchive);
> Path path = vfs.getPath("out.json");
> try (BufferedWriter writer = Files.newBufferedWriter(path, Charset.forName("UTF-8"))) {
> new GsonBuilder().create().toJson("Test", writer);
> }
> try (BufferedReader reader = Files.newBufferedReader(path, Charset.forName("UTF-8"))) {
> assertEquals("Test", new GsonBuilder().create().fromJson(reader), String.class));
> }
> }
> {code}
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