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• Handling downloads in Java

  - by Tereno

  Hi there, How would I be able to handle downloads using HttpResponse in Java? I made an HttpGet request to a specific site - the site returns the file to be downloaded. How can I handle this download? InputStream doesn't seem to be able to handle it (or maybe I'm using it the wrong way.)

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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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• Can not load the images in Java Swing when running from a .jar-file

  - by Jonas

  I can run my Java Swing application from Eclipse without problems. But when I run it from a .jar-file, the images fails to load. I load my images with: setIconImage(Toolkit.getDefaultToolkit(). getImage(getClass().getResource("../images/logo.png"))); How can I load the images so they work even when I'm running from a .jar-file?

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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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• GUI development in JAVA

  - by user309281

  Hi All To build a java-based GUI using jsp and servlets, what are the different factors that go into selection of frameworks like AJAX, JSF, Struts 1/Struts 2 etc. Also for each of the above pls throw some light on, what are the libraries, toolkits and IDE which are available? Thanks.

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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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• Capture SIGINT in Java

  - by Begui

  What is the best way to capture a kill signal in java without using JNI. I did discover the sun.misc.Signal and the sun.misc.SignalHandler and the warning of the possibility of being removed in the future releases. Would using JNI to call a c lib be the only option i have?

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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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• Create Word/RTF file with table of contents from Java

  - by Glen

  Hi, I want to create a Word or RTF file with a table of contents (with links to each section) from Java. From my understanding, iText & Apache POI do not support generating a table of contents. Some clients of the app still use older versions of Word, so I need a library that supports the older Word doc format. Does anyone know how I can do this? Thanks, Glen

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• Auto convert java source to use generic rather than raw types

  - by Sam

  Is there a way/tool to auto convert Java source code from using raw types to using generic types? I have some legacy code with 677 references to raw types: ArrayList 47 Vector 420 Hashtable 61 Enumeration 64 Class 7 Iterator 78 TOTAL 677 Now I could manually look through the code to infer the generic types and replace, but that is going to take a long time.

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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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• 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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• 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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• 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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• 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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• 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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• 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.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 Webstart...interaction with browsers on different platforms

  - by milesmeow

  This post is similar to this post, but not exactly, so I'm asking this question. How does one go about, From a Java WebStart app: launch a new browser window with a target URL? bring an existing browser window into focus with a target URL? Is the solution OS/platform independent? Does it matter which browser you're talking to?

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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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• 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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• 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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• 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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• 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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