Exception in thread "main" com.dropbox.core.NetworkIOException: Read timed out

[Yusuf ..]

The code I'm running is this;

public class test {
static final String ACCESS_TOKEN = "<REDACTED>";
public static void main(String args[]) throws DbxException, IOException, InterruptedException
{
DbxRequestConfig config = new DbxRequestConfig("dropbox/java-tutorial", "en_US");
DbxClientV2 client = new DbxClientV2(config, ACCESS_TOKEN);
//System.out.println(config.httpRequestor.DefaultTimeoutMillis);
FullAccount account = null;
account = client.users.getCurrentAccount();
System.out.println(account);
List<Metadata> entries = client.files.listFolder("").getEntries();
//WritetoFile jal = new WritetoFile("/semesterProject.client/", "text.txt");
for (Metadata metadata : entries) {
System.out.println(metadata.getName());
//System.out.println(jal.getClass());
//jal.addtoFile(metadata.name);
}
File file = new File("/semesterProject.client/text.txt");
if(!file.exists()) {
System.out.println("File does not exist");
file.createNewFile();// create your file on the file system
}
if(file.exists())
{
System.out.println("File exists");
}
//InputStream in = new FileInputStream(file);
//FileMetadata metadata = client.files.uploadBuilder("/semesterProject.client/text.txt").uploadAndFinish(in);
//DisplayTextFile newfile = new DisplayTextFile("/semesterProject.client/text.txt");
//for(int i=0; i<newfile.getList().size(); i++)
//{
//System.out.println(newfile.getList().get(i));
//}
//System.out.println(DbxEntry.Folder.class);
DbxClientV1 client45 = new DbxClientV1(config, ACCESS_TOKEN);
client45.createFolder("/doggone");
DbxEntry.Folder fold= new DbxEntry.Folder("/doggone", "dog", false);
//System.out.println(fold.toString());
ArrayList kal = null;
//kal = new ArrayList(newfile.getList());
//OrderList kal2 = new OrderList(kal);
//Hashtable mak=kal2.orderAlphabetically();
//sortJava sorting =new sortJava(kal);
//final String[] get=sorting.sorted();
//System.out.println(get[2]);
JFrame frame = new JFrame("FrameDemo");
JTextArea text = new JTextArea();
int k=0;
//Set kalll=mak.keySet();
//Object[] objectarray= new Object[kalll.size()];
//kalll.toArray(objectarray);
//text.setColumns(objectarray.length);
/*while(k<objectarray.length)
{
/text.append((String) mak.get((objectarray[k]))+"\n");
k++;
}*/
frame.add(text);
frame.setVisible(true);
entries = client.files.listFolder("").getEntries();
for (Metadata metadata2 : entries) {
//System.out.println(metadata2.pathLower);
// jal.addtoFile(metadata.name);
}
frame.dispose();
getAllFolders(entries, client);
}
public static void getAllFolders(List <Metadata> entries, DbxClientV2 client ) throws DbxException, IOException
{
ArrayList<String> folders = new ArrayList<String>();
int count =0;
folders.add("");
getfolders(folders, count);
for(int foldercount=0; foldercount<folders.size();foldercount++)
{
System.out.println(folders.get(foldercount)+"KALL");
}
}
public static void getfolders(ArrayList<String> folders, int count) throws DbxException
{
for(int foldercount=count; foldercount<folders.size();foldercount++)
{
DbxRequestConfig config = new DbxRequestConfig("dropbox/java-tutorial", "en_US");
DbxClientV2 client2 = new DbxClientV2(config, ACCESS_TOKEN);
DbxClientV1 client3 = new DbxClientV1(config, ACCESS_TOKEN);
System.out.println(folders.get(foldercount));
List <Metadata>entries = client2.files.listFolder(folders.get(foldercount)).getEntries();
int hal=0;
for (Metadata metadata : entries)
{
DbxDelta<DbxEntry> result = null;
if(!folders.get(foldercount).startsWith("/"))
{
result = client3.getDeltaWithPathPrefix(null, "/"+folders.get(foldercount));
}
else
{
result = client3.getDeltaWithPathPrefix(null, folders.get(foldercount));
}
List<Entry<DbxEntry>> cursor = result.entries;
for (Entry<DbxEntry> entry : cursor)
{
if(entry.metadata.isFolder())
{
folders.add(entry.metadata.path);
}
}
hal++;
System.out.println(hal);
}
client3 = new DbxClientV1(config, ACCESS_TOKEN);
}
count++;
getfolders(folders, count);
}
}

And the error message I'm getting is this;

Exception in thread "main" com.dropbox.core.NetworkIOException: Read timed out
at com.dropbox.core.DbxRequestUtil.readJsonFromResponse(DbxRequestUtil.java:364)
at com.dropbox.core.v1.DbxClientV1$8.handle(DbxClientV1.java:1579)
at com.dropbox.core.v1.DbxClientV1$8.handle(DbxClientV1.java:1575)
at com.dropbox.core.DbxRequestUtil.finishResponse(DbxRequestUtil.java:432)
at com.dropbox.core.DbxRequestUtil$2.run(DbxRequestUtil.java:425)
at com.dropbox.core.DbxRequestUtil.runAndRetry(DbxRequestUtil.java:469)
at com.dropbox.core.DbxRequestUtil.doPostNoAuth(DbxRequestUtil.java:421)
at com.dropbox.core.DbxRequestUtil.doPost(DbxRequestUtil.java:410)
at com.dropbox.core.v1.DbxClientV1.doPost(DbxClientV1.java:2222)
at com.dropbox.core.v1.DbxClientV1._getDelta(DbxClientV1.java:1575)
at com.dropbox.core.v1.DbxClientV1.getDeltaWithPathPrefix(DbxClientV1.java:1536)
at test.getfolders(test.java:129)
at test.getAllFolders(test.java:108)
at test.main(test.java:101)
Caused by: java.net.SocketTimeoutException: Read timed out
at java.net.SocketInputStream.socketRead0(Native Method)
at java.net.SocketInputStream.socketRead(SocketInputStream.java:116)
at java.net.SocketInputStream.read(SocketInputStream.java:170)
at java.net.SocketInputStream.read(SocketInputStream.java:141)
at sun.security.ssl.InputRecord.readFully(InputRecord.java:465)
at sun.security.ssl.InputRecord.readV3Record(InputRecord.java:593)
at sun.security.ssl.InputRecord.read(InputRecord.java:532)
at sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:973)
at sun.security.ssl.SSLSocketImpl.readDataRecord(SSLSocketImpl.java:930)
at sun.security.ssl.AppInputStream.read(AppInputStream.java:105)
at java.io.BufferedInputStream.fill(BufferedInputStream.java:246)
at java.io.BufferedInputStream.read1(BufferedInputStream.java:286)
at java.io.BufferedInputStream.read(BufferedInputStream.java:345)
at sun.net.www.http.ChunkedInputStream.fastRead(ChunkedInputStream.java:244)
at sun.net.www.http.ChunkedInputStream.read(ChunkedInputStream.java:689)
at java.io.FilterInputStream.read(FilterInputStream.java:133)
at sun.net.www.protocol.http.HttpURLConnection$HttpInputStream.read(HttpURLConnection.java:3335)
at com.fasterxml.jackson.core.json.UTF8StreamJsonParser.loadMore(UTF8StreamJsonParser.java:207)
at com.fasterxml.jackson.core.json.UTF8StreamJsonParser.slowParseName(UTF8StreamJsonParser.java:1877)
at com.fasterxml.jackson.core.json.UTF8StreamJsonParser._parseName(UTF8StreamJsonParser.java:1669)
at com.fasterxml.jackson.core.json.UTF8StreamJsonParser.nextToken(UTF8StreamJsonParser.java:752)
at com.dropbox.core.json.JsonDateReader$1.read(JsonDateReader.java:29)
at com.dropbox.core.json.JsonDateReader$1.read(JsonDateReader.java:19)
at com.dropbox.core.json.JsonReader.readField(JsonReader.java:48)
at com.dropbox.core.v1.DbxEntry._read(DbxEntry.java:872)
at com.dropbox.core.v1.DbxEntry.read(DbxEntry.java:827)
at com.dropbox.core.v1.DbxEntry$1.read(DbxEntry.java:611)
at com.dropbox.core.v1.DbxEntry$1.read(DbxEntry.java:607)
at com.dropbox.core.json.JsonReader.readOptional(JsonReader.java:58)
at com.dropbox.core.v1.DbxDelta$Entry$Reader.read(DbxDelta.java:274)
at com.dropbox.core.v1.DbxDelta$Entry$Reader.read(DbxDelta.java:248)
at com.dropbox.core.v1.DbxDelta$Entry$Reader.read(DbxDelta.java:237)
at com.dropbox.core.json.JsonArrayReader.read(JsonArrayReader.java:44)
at com.dropbox.core.json.JsonArrayReader.read(JsonArrayReader.java:33)
at com.dropbox.core.json.JsonReader.readField(JsonReader.java:48)
at com.dropbox.core.v1.DbxDelta$Reader.read(DbxDelta.java:130)
at com.dropbox.core.v1.DbxDelta$Reader.read(DbxDelta.java:102)
at com.dropbox.core.v1.DbxDelta$Reader.read(DbxDelta.java:91)
at com.dropbox.core.json.JsonReader.readFully(JsonReader.java:565)
at com.dropbox.core.json.JsonReader.readFully(JsonReader.java:458)
at com.dropbox.core.DbxRequestUtil.readJsonFromResponse(DbxRequestUtil.java:359)
... 13 more

Is there any way of solving this without changing the timeout timer? If there isn't, how can I change the timeout period?

[Yusuf ..]

Not sure if it will work for others, but having 

static final DbxRequestConfig config = new DbxRequestConfig("testtest/1.0", "en_US");

has helped me.

Nonetheless, I have a problem of getting folders from shared files, as listfolder just gets the Metadata, which I cannot check if it contains folder or not.

[Greg-DB]

Hi Yusuf, I'm glad to hear you got that working already.

I'm not sure if I understand your follow up question though, can you elaborate? If you mean you need to distinguish between files and folders given a Metadata object, you can do so by checking the class. FileMetadata, FolderMetadata, and DeletedMetadata are subclasses of metadata. Here's a sample of checking between them:

https://github.com/dropbox/dropbox-sdk-java/blob/152c926bfe357f555e5714835c43fba0838a89b9/examples/a...

By the way, I redacted your access token, but for the sake of security, you should disable it now. You can do so by revoking access to the app entirely, if the access token is for your account, here:

https://www.dropbox.com/account/security

Or, you can disable just this access token using the /disable_access_token endpoint:

https://www.dropbox.com/developers/core/docs#disable-token

[Yusuf ..]

The fundamantel problem I had was to check whether the files were folders or not. That wasn't possible with Metadata, but it was possible with client3.getMetadataWithChildren().

For some reason however, client3.getDeltaWithPathPrefix() does not get shared folders while getMetadataWithChildren does.

[Greg-DB]

Thanks for clarifying. It sounds like you're talking about using listFolder for API v2, which returns a Metadata object, as opposed to getMetadataWithChildren for API v1.

In that case, my reply does apply.  Check out this sample for an example of how you can tell between files and folders when you have a Metadata object:

https://github.com/dropbox/dropbox-sdk-java/blob/152c926bfe357f555e5714835c43fba0838a89b9/examples/a...

In short, you can use instanceof to check if it's a FolderMetadata or FileMetadata (or DeletedMetadata).

Also, when you use getDeltaWithPathPrefix, are you checking hasMore on the response? If getDeltaWithPathPrefix is true, you need to call back again to get more results.

[Yusuf ..]

Alright, the problem seems to restart again, as after a while when I'm trying to access to client, same NetworkIOException occurs, regardless of how many times I reinitialize DbxClientV2 and DbxClientV1.

[Greg-DB]

Since it sounds like the NetworkIOException problem is intermittent, is it possible it's related to issues with your network connection. For example, are you able to reproduce the issue when using a different Internet connection?

[Yusuf ..]

Took me long to response, but yes, regardless of the connection I get this.

[Greg-DB]

Thanks for following up. Can you give me a better idea of how much/often you see this so we can look into it? Specifically, does it happen consistently, or only sporadically, and in either case, when you are seeing failures, what percent of your API calls fail? Thanks in advance!