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  • Object tree navigation language in Java

    - by lewap
    In the system which I'm currently developing I often have to navigate an object tree and based on its state and values take actions. In normal Java this results in tedious for loops, if statements etc... Are there alternative ways to achieve tree navigation, similar to XPath for XML? I know there is JXPath and OGNL, but do you know any other libraries for such purpose? Do you know any libraries which generate bytecodes for specific tree navigation expressions to make the processing as fast as Java native fors and ifs?

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  • Are there macro facility for Java or C#?

    - by h2g2java
    Macros are useful. Therefore, I occasionally bemoan the absence of macros in Java and C#. Macros allow me to force in-line but allow me the code-manageability of non-macro code. Is there any Java- or C#-based project/product somewhere out there that effectively allow macros or specifying in-line expansion. I am thinking of something like @macro public void hello(int x){ ... } or when I call a method, an @inline annotation preceding the call would effect the called-method to be in-lined. or, should I need to know that I should just trust the compiler to make the best the decision for me that at the best of its analysis it might in-line a call. I hope this question will not lead to debating the pro/cons/usefulness of macros.

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  • SSL HandShake on Java Client

    - by JKV
    I have a very basic doubt in SSL HandShake. Assume that we have a server S which uses self signed certificates. I write a Java client C which connects to the S. When C connects to S, C gets certificates from S and saves them to its truststore and the remaining part of the communication proceeds. After some time I use the same C to connect to the S, so will S send the certificates again to C, or C will use the certificates already stored in truststore. I am not good in SSL and underlying implementation of Truststore functionality in Java. Will S send the certificates to C invariable of whether the C has certificates on its truststore?? I believe that if I have certificates in truststore C trusts S and C will not ask for certificates when I connect again?? Is my assumption right?? Is the process same for self-signed certificates and CA certificates?? Thanks in advance.

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  • Java - Google App Engine - InvalidClassException when I change a class that was stored in session sc

    - by Spines
    I updated my User class, and now whenever someone that had the old version of the User class stored in their session scope accesses my site, I get an InvalidClassException. javax.servlet.ServletException: java.lang.RuntimeException: java.io.InvalidClassException: User; local class incompatible: stream classdesc serialVersionUID = 4949038118012519093, local class serialVersionUID = -971500502189813151 How do I stop this error from happening for those users? I could probably invalidate everyone's sessions every time I want to update a class that gets stored in session scope, but is there a better way, so that my user's don't have to login again?

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  • Best language to learn complementing java

    - by danielrutledge
    Hi all, I'm a somewhat experienced java ee developer, and I wish to complement my background by learning a newish language. I'm recently out of school where I did a ton of scientific computing and some functional programming, so I'm pretty comfortable with those families of languages. If at all possible, I'd like to pick a language with some market value, though I know this is tough to gauge. After snooping around a bit, the consensus seems to be one of Python/Ruby/Perl; how would each of these work with java in a web application environment, and in your opinion which complements it best? Any other suggestions for languages would also be welcome.

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  • Java, searching through folders to match a name

    - by Nick
    Hi folks, I using java to search for a file or folder that matches a specific case. For instance i want to search through all the files and folders and iterate through them as many times as necessary untill i find a result. The catch I searching for files and folders through a binary image of a file system. This means i doubt there are any preexisting classes such java.file.* to do it for me. If it helps i can tell you that i can tell the difference between files and folders easily enough. (a folder is flagged as 0x20) The only way i can think of is to do a standard loop and iterated several times but this limits me if a file or folder is several folders deep. All input greatly welcome

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  • Converting Json to Java

    - by Binaryrespawn
    Hi all, I want to be able to access properties from a json string within my java action method. The string is available by simply saying myJsonString = object.getJson(); Below is an example of what the string can look like: {'title': 'Computing and Information systems','id':1,'children': 'true','groups': [{'title': 'Level one CIS','id':2,'children': 'true','groups':[{'title': 'Intro To Computing and Internet','id':3,'children': 'false','groups':[]}]}]} In this string every json object contains an array of other json objects. The intention is to extract a list of id's where any given object possessing a group property that contains other json objects. I looked at google's Gson as a potential json plugin. Can anyone offer some form of guidance as to how I can generate java from this json string? Thank you, Kind regards.

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  • telling java to accept self-signed ssl certificate

    - by Nikita Rybak
    It looks like a standard question, but I couldn't find clear directions anywhere. I have java code trying to connect server with probably self-signed (or expired) certificate. It gives something like this [HttpMethodDirector] I/O exception (javax.net.ssl.SSLHandshakeException) caught when processing request: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target As I understand, I have to play around with keytool and tell java that it's ok to allow this connection. But all comments I've found assume I'm fully proficient with keytool, like "generate private key for server and import it into keystore". And I'm not. Is there anybody who could post detailed instructions? I'm running unix, so bash script would be best. Not sure if it's important, but code executed in jboss. Thanks a lot!

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  • Building Java projects with circular imports in Eclipse

    - by Buggieboy
    I have a legacy Java (not my native language) app that I'm trying to build in Eclipse Galileo. As it's not my own, I can't speak to the quality of the design, but I am coming across a number of instances where I'll have something like this: In a project called, say, "lib_a", I'll have a file containing this: import com.acme.lib_b.onething; Project "lib_b" on the other hand, will contain: import com.acme.lib_a.anotherthing; Of course, the problem is that one project can't be built because the errors prevent me from creating a .jar file that can be added as an external archive to the other project, and vice versa. It seems to me that this must be a fairly common occurence in building Java applications. Rewriting it from scratch is not an option here, so I'd like to know "what other folks do."

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  • Java: Sockets or RMI?

    - by StillLearning
    Hi, I need to separate our application into a light-weight gui application and a business logic application. This won't be a client/server setup as such, as the 'server' component will only have one client. The other limitation in the application is that it has only one entry/exit point. Therefore if we were to use RMI, it would only ever be on one function. All form data is already wrapped up into a string and passed through one transport area. Should I just use Java Sockets to enhance this application, or go with RMI? Or some other Java technology? I made a previous post outlining the requirements of our application, however it went unanswered. http://stackoverflow.com/questions/2604528/terminal-panel-pc-single-server-solution-client-server-or-rdp Cheers.

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  • check for naming convention in java.

    - by Vivart
    through java reflection how to check that method name is in camelCase? e.g. import java.lang.reflect.*; public class TestClass { private int simpleMethod( Object p, int x) throws NullPointerException { if (p == null) throw new NullPointerException(); return x; } public static void main(String args[]) { try { Class cls = Class.forName("method1"); Method methlist[] = cls.getDeclaredMethods(); for (int i = 0; i < methlist.length; i++) { Method m = methlist[i]; System.out.println("name= " + m.getName()); } } catch (Throwable e) { System.err.println(e); } } } here i am getting method names simpleMethod and main i have to check that these names are in camelCase.

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  • Problem with greek characters using java

    - by Subhendu Mahanta
    I am trying to write greek characters to a file using java like this: String greek = "\u03c1\u03ae\u03bc. \u03c7\u03b1\u03b9\u03c1\u03b5\u03c4\u03ce"; try { BufferedWriter out = new BufferedWriter(new FileWriter("E:\\properties\\outfilename.txt")); out.write(greek); out.close(); } catch (IOException e) { } Not working. Tried to use javac -encoding ISO-8859-7. Also tried java -Dfile.encoding=ISO-8859-7. Assuming that as I do not have greek font in my pc, I downloaded achillies (greek font - Ach4.ttf).Installed it by going to control panel fonts. Any ideas?

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  • Read / write program in Java using JFileChooser

    - by Casper Marcussen
    Didn't want to bother people in here, but since I am under a time pressure, I am desperate to get help. My questions is how to link the file choosen from a JFileChooser to a file, and how to convert it to string being able to display and edit it in a TextArea. I have the GUI set up using swing, but the link between actionListener and the JFileChooser is not complete. Any help would be much appreciated. Code: http://pastebin.com/p3fb17Wi EDIT: I found this program, that does pretty much what i wanted to, but it does not allow me to save the actual file : http://www.java-forums.org/new-java/8856-how-get-content-text-file-write-jtextarea.html

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  • Creating a desktop icon using JWS JNLP for a JavaFX app.

    - by Sleepycat
    I am trying to get a custom destop icon to be displayed for my app but for some reason no matter what I do the same default java icon shows up. I have tried everything I can think of and gone and compared my jnlp file with others whose icons seem to work ok. According to everything I have read the following should work fine. But of course, it doesn't: <information> <title>MikesApp</title> <vendor>Mike</vendor> <homepage href="http://www.mikesapp.com/"/> <description>Mikes App.</description> <icon kind="shortcut" href="res/icon64x64.png" width="64" height="64"/> <offline-allowed/> <shortcut> <desktop/> </shortcut> </information> Any ideas would be greatly appreciated.

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  • Adding Java packages to GWT

    - by Organiccat
    I've tried searching but couldn't come up with a defined way on how to add your own packages to a GWT project. My tree structure looks like this: -com.mycompany -public MyApplication.html MyApplication.gwt.xml -com.mycompany.client MyApp.java -com.mycompany.gui TableLayout.java The answer I've seen out there says to add the packages relative to the root directory of the gwt.xml file, like so: <module> <inherits name="com.google.gwt.user.User" /> <entry-point class="com.mycompany.client.MyApp" /> <source path="client" /> <source path="gui" /> </module> It then complains: Unable to find type 'com.technicon.client.MyApp' Hint: Previous compiler errors may have made this type unavailable Hint: Check the inheritance chain from your module; it may not be inheriting a required module or a module may not be adding its source path entries properly Can anyone tell me what I'm doing wrong and how to fix this?

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  • (External) Java library for creating Tree structure ?

    - by suVasH.....
    I am planning to implement a tree structure where every node has two children and a parent along with various other node properties (and I'd want to do this in Java ) Now, the way to it probably is to create the node such that it links to other nodes ( linked list trick ), but I was wondering if there is any good external library to handle all this low level stuff. ( for eg. the ease of stl::vector vs array in C++ ). I've heard of JDots, but still since i haven't started (and haven't programmed a lot in Java), I'd rather hear out before I begin.

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