Java – SocketTimeoutException when ConnectTimeout and ReadTimeout is infinite?

androidhttpurlconnectionjavasocket-timeout-exception

Possible Duplicate:
Receiving request timeout even though connect timeout and read timeout is set to default (infinite)?

I tried to connect to a web service and received a SocketTimeoutException after approximately 20 seconds. The Tomcat server hosting the web service is down so the Exception is expected. However, I did not set the value of my ConnectTimeout and ReadTimeout. According to the documentation, the default values of these two are infinite.

One possibility for this is that the server I tried connecting to has its own timeout. But when my friend tried to connect to it using iOS, his connection timed out after approximately 1 minute and 15 seconds. If the server is the one issuing the timeout, our connection should have timed out at almost the same time. Please note that he is also using the default time out of iOS.

Why did my socket timed out so early when my connect and read timeout are set to infinite?
Is socket timeout different to connect and read timeout? If so, how is it different?
How can I know the value of my socket timeout? I am using HttpURLConnection.
Is there a way to set the socket timeout? How?

Below is a snippet of my code:

httpURLConnection = (HttpURLConnection) ((new URL("http://www.website.com/webservice")).openConnection());
httpURLConnection.setDoInput(isDoInput);
httpURLConnection.setDoOutput(isDoOutput);
httpURLConnection.setRequestMethod(method);

try
{
    OutputStreamWriter writer = new OutputStreamWriter(httpURLConnection.getOutputStream());
    writer.write("param1=value1");
    writer.flush;
}catch(Exception e)
{

}

Best Answer

Why did my socket timed out so early when my connect and read timeout are set to infinite?

Code please.

Is socket timeout different to connect and read timeout? If so, how is it different?

SocketTimeoutException is a read timeout.

How can I know the value of my socket timeout? I am using HttpURLConnection.

HttpURLConnection.getReadTimeout(); also HttpURLConnection.getConnectTimeout().

Is there a way to set the socket timeout? How?

HttpURLConnection.setReadTimeout().

You have already cited all these methods in your original post. Why are you asking about them here?

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Java – reflection and why is it useful

The name reflection is used to describe code which is able to inspect other code in the same system (or itself).

For example, say you have an object of an unknown type in Java, and you would like to call a 'doSomething' method on it if one exists. Java's static typing system isn't really designed to support this unless the object conforms to a known interface, but using reflection, your code can look at the object and find out if it has a method called 'doSomething' and then call it if you want to.

So, to give you a code example of this in Java (imagine the object in question is foo) :

Method method = foo.getClass().getMethod("doSomething", null);
method.invoke(foo, null);

One very common use case in Java is the usage with annotations. JUnit 4, for example, will use reflection to look through your classes for methods tagged with the @Test annotation, and will then call them when running the unit test.

There are some good reflection examples to get you started at http://docs.oracle.com/javase/tutorial/reflect/index.html

And finally, yes, the concepts are pretty much similar in other statically typed languages which support reflection (like C#). In dynamically typed languages, the use case described above is less necessary (since the compiler will allow any method to be called on any object, failing at runtime if it does not exist), but the second case of looking for methods which are marked or work in a certain way is still common.

Update from a comment:

The ability to inspect the code in the system and see object types is not reflection, but rather Type Introspection. Reflection is then the ability to make modifications at runtime by making use of introspection. The distinction is necessary here as some languages support introspection, but do not support reflection. One such example is C++

Java – What are the differences between a HashMap and a Hashtable in Java

There are several differences between HashMap and Hashtable in Java:

Hashtable is synchronized, whereas HashMap is not. This makes HashMap better for non-threaded applications, as unsynchronized Objects typically perform better than synchronized ones.
Hashtable does not allow null keys or values. HashMap allows one null key and any number of null values.
One of HashMap's subclasses is LinkedHashMap, so in the event that you'd want predictable iteration order (which is insertion order by default), you could easily swap out the HashMap for a LinkedHashMap. This wouldn't be as easy if you were using Hashtable.

Since synchronization is not an issue for you, I'd recommend HashMap. If synchronization becomes an issue, you may also look at ConcurrentHashMap.

Best Answer

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Java – reflection and why is it useful

Java – What are the differences between a HashMap and a Hashtable in Java

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