TestNG parallel Execution with DataProvider
You need to use dataproviderthreadcount. The threadpoolsize and invocationcount values are not required. See details here.
java
Java: how to abort a thread reading from System.in
Heinz Kabutz’s newsletter shows how to abort System.in reads: import java.io.*; import java.util.concurrent.*; class ConsoleInputReadTask implements Callable<String> { public String call() throws IOException { BufferedReader br = new BufferedReader( new InputStreamReader(System.in)); System.out.println(“ConsoleInputReadTask run() called.”); String input; do { System.out.println(“Please type something: “); try { // wait until we have data to complete a readLine() while … Read more
StackOverflowError computing factorial of a BigInteger?
The problem here looks like its a stack overflow from too much recursion (5000 recursive calls looks like about the right number of calls to blow out a Java call stack) and not a limitation of BigInteger. Rewriting the factorial function iteratively should fix this. For example: public static BigInteger factorial(BigInteger n) { BigInteger result … Read more
How to fetch hibernate query result as associative array of list or hashmap
You have to use the “new map” syntax (Hibernate Reference paragraph 14.6) select new map(count(i.inspectionId) as tot_inspections, t.year as year, t.quarter as quarter) from … The rest of the query is the same. This will return a list of maps, where the key is the alias of the “column”.
Difference between throw and throws in Java? [duplicate]
throws clause is used to declare an exception and throw keyword is used to throw an exception explicitly. If we see syntax wise then throw is followed by an instance variable and throws is followed by exception class names. The keyword throw is used inside method body to invoke an exception and throws clause is … Read more
How to transmit live video from within a Java application?
Honestly don’t waste your time with JMF, you can consider that offering dead. Here is how you would do screen shotting to an rtmp stream using h.264 (thanks to [email protected] for the example). If the code doesn’t show up here’s pastebin for it: http://pastebin.com/sJHwj0nW import com.xuggle.xuggler.Configuration; import com.xuggle.xuggler.ICodec; import com.xuggle.xuggler.IContainer; import com.xuggle.xuggler.IContainerFormat; import com.xuggle.xuggler.IPacket; import … Read more
how to read from standard input non-blocking?
Using BufferedReader.available() as suggested by Sibbo isn’t reliable. Documentation of available() states: Returns an estimate of the number of bytes that can be read… It is never correct to use the return value of this method to allocate a buffer. In other words, you cannot rely on this value, e.g., it can return 0 even … Read more
Multiple .class files generated for a class?
These are for inner classes and static nested classes. The ones with numbers are anonymous inner classes. For example: class Foo { class Bar { } static class Baz { } void run() { Helper t = new Helper() { int helpMethod() { return 2; } }; } } This will produce class files Foo.class, … Read more
Does Java Connection.close rollback?
According to the javadoc, you should try to either commit or roll back before calling the close method. The results otherwise are implementation-defined.