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• Exception in thread "main" java.lang.NoSuchMethodError: main

  - by David

  when i try to compile this: public class Risk { } class territory { public static void main (String[]arg) { System.out.println ("hi") ; } } I get this error message: Exception in thread "main" java.lang.NoSuchMethodError: main whats going wrong here?

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• Cleanest way to build an SQL string in Java

  - by Vidar

  I want to build an SQL string to do database manipulation (updates, deletes, inserts, selects, that sort of thing) - instead of the awful string concat method using millions of "+"'s and quotes which is unreadable at best - there must be a better way. I did think of using MessageFormat - but its supposed to be used for user messages, although I think it would do a reasonable job - but I guess there should be something more aligned to SQL type operations in the java sql libraries. Would Groovy be any good? Any help much appreciated.

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• Is there an equivalent to BCEL (Java .class manipulation) but in C or C++

  - by Barry Kelly

  Is there a C or C++ compatible library for reading and writing Java class files? I.e. something like Apache BCEL.

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• How to troubleshoot an unresponsive Java application/process in Linux

  - by Sasha

  Say your application is unresponsive and you cannot attach a debugger to it, as it rejects everything. All you have is a Linux Bash and process id. How would you investigate the issue? What tools would you use? My goal is to better my troubleshooting skills using Java. This particular issue we had in production, on customer site.

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• How I can use searching by Hibernate with Java

  - by ruby

  Hi All ; I want to make searching on my database with hibernate in Java, how can I do that? Normally when I am using JDBC I wrote this code : String Sql="select * from table1 where id like '"+jTextField1.getText()+"%'"; but I want to do that with hibernate database operation, do I need to use session.load(..) ? Thanks from now...

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• Java Socket Programming

  - by Bapi

  Java Socket Program did not work for WAN I have written a TCP IP socket program which works fine in my LAN. One of my friend is at bangalore He ran the server and I ran the client with the host name of my friend's IP. In this case my socket program did not work.

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• Is there something like find_if in Java?

  - by FredOverflow

  In C++, I can use find_if with a predicate to find an element in a container. Is there something like that in Java? The contains method on collections uses equals and can not be parameterized.

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• Good-looking Java Swing Look&Feel?

  - by eric

  I'm working on an open-source Java Web Start application, and I'd like to give it a consistent theme across platforms. Metal is totally ugly, and I'm not particularly happy with Substance (esp. performance). What are the best Swing Look&Feel options out there today?

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• Java findout if current platform supports windowing

  - by JHollanti

  Is there way to find out if Java is running on a platform which supports windowing of any kind? I know that you could possibly figure it out by reading in the environment variables, but that might prove to be rather difficult with all the possible combinations.

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• Generating exactly prime number with Java

  - by Viet

  Hi, I'm aware of the function BigInteger.probablePrime(int bitLength, Random rnd) that outputs probably prime number of any bit length. I want a REAL prime number in Java. Is there any FOSS library to do so with acceptable performance? Thanks in advance!

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• Java Deflater strategies - DEFAULT_STRATEGY, FILTERED and HUFFMAN_ONLY

  - by Keyur

  I'm trying to find a balance between performance and degree of compression when gzipping a Java webapp response. In looking at the Deflater class, I can set a level and a strategy. The levels are self explanatory - BEST_SPEED to BEST_COMPRESSION. I'm not sure regarding the strategies - DEFAULT_STRATEGY, FILTERED and HUFFMAN_ONLY I can make some sense from the Javadoc but I was wondering if someone had used a specific strategy in their apps and if you saw any difference in terms of performance / degree of compression. Thanks, Keyur

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• Can you recommend a lightweight java portlet software?

  - by Avi Y

  Hello, I am a long time java web developer but I am new to portlets technology. Currently I am in the stage of finding my options. I have tried Liferay and although it is very cool, it is a bit heavy for my needs. Can you recommend a more lightweight portlet container?

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• Create a Sorted Hash in Java with a Custom Comparator

  - by kunjaan

  I want to create a TreeMap in Java with a custom sort order. The sorted keys which are string need to be sorted according to the second character. The values are also string. Sample Hash: Za,FOO Ab,Bar

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• List MySQL enum in Java

  - by Pieter

  Is there a way to get all possible values from a MySQL enum column? The MySQL documentation says the MySQL enum type is returned as a Java String, so I basically would like a way to get all possible strings I can pass when querying a table with such an enum. I couldn't immediately find anything when I was looking through the metadata returned for such a column, but since enum isn't standard SQL, I'm not sure it's even possible... any suggestions?

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• java.lang.RuntimeException: Spurious serialisation error

  - by sandeep

  I had problem with my client program when I run my client in eclipse or netbeans, I get a runtime error java.lang.RuntimeException: Spurious serialisation error. But when i use command prompt I have no errors. Here is my client code http://pastebin.com/jUkw7F7k

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• Java class object from type variable

  - by Alexander Temerev

  Is there a way to get Class object from the type variable in Java generic class? Something like that: public class Bar extends Foo<T> { public Class getParameterClass() { return T.class; // doesn't compile } } This type information is available at compile time and therefore should not be affected by type erasure, so, theoretically, there should be a way to accomplish this. Does it exist?

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• Java socket close timeout

  - by Shayan

  In java when you close a socket it doesn't do anything anymore but it actually closes the tcp connection after a timeout time. I need thousands of sockets and I want them to be closed exactly after closed them not after wasting my time and my resources! What can I do? Thank you.

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• Validate Boolean Query - java

  - by JavaUser

  hi, I need the java code snippet for the below logic: Following is a string and I need to validate the string based on the below condition : "100 or 200 and 345 not 550 " - Valid string "abc or 200 and 345 SAME ** 550 " - Not a Valid String 1 . the operands(eg 100,200 ..) should be positive numbers 2 . the operator should be and/or/not Thx

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• How to sanity check a date in java

  - by Bloodboiler

  I find it curious that the most obvious way to create Date objects in Java has been deprecated and appears to have been "substituted" with not so obvious to use lenient calendar. So... How do you check that a date given as a combination of day, month and year is a valid date? For instance a date 2008-02-31 (as in yyyy-mm-dd) would be invalid date.

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• Java - why no return type based method overloading?

  - by llm

  I know this is not possible but can anyone provide a theory as to why Java chose not to support this? I am asking because I just ran into a situation where I think it would be nice to have.

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• Java programs using NIO framework

  - by peng

  Hello, everyone I am doing some research related to Java NIO. I need to find some representative applications that are based on this framework. Please feel free to suggest! The more, the merrier! Thanks

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• Create a java Date Picker component?

  - by Venkats

  I have the datepicker component in the format of MM/dd/yyyy, But I want to create date picker in java the form of dd/MM/yyyy. So where can I get the suggestion or related solutions. Please give the basic idea about that. Thanks in Advance..

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• Extract german zipcode from line in Java

  - by tzippy

  hello! I need to extract the zipcode from file's line. each line contains an adress and is formatted in a different way. eg. "Großen Haag 5c, DE-47559 Kranenburg" or "Lange Ruthe 7b, 55294 Bodenheim" the zipcode is always a five digit number and sometimes follows "DE-". I use Java. Thanks a lot!

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• any RAD tool for java app development ?

  - by fwfwfw

  is there some RAD tool for creating java apps with event driven flow ? basically like visual basic.

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• try/catch on stack overflows in java?

  - by stereos

  Can you try/catch a stack overflow exception in java? It seems to be throwing itself either way. When my procedures overflows, I'd like to "penalize" that value.

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