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JAVA QUESTIONS

how to learn Drools or another rule engine fast
how to learn Drools or another rule engine fast
Any of those help What joekutner said + a recent 1hr Fosdem "introduction" video. Despite the comments, it's actually really good, but what you have to have is the slides, so that you can follow through in a sane fashion. Here is a link to the Youtub
TAG : java
Date : November 26 2020, 07:01 PM , By : Cyber Indigo
Date Sorting - Latest to Oldest
Date Sorting - Latest to Oldest
around this issue , To be sure you can use:
TAG : java
Date : November 26 2020, 07:01 PM , By : Lukas
unable to add objects to saved collection in GAE using JDO
unable to add objects to saved collection in GAE using JDO
I wish this helpful for you "no matching index found" Perhaps you need to add some index in GAE/J's datastore ? Nothing to do with JDO
TAG : java
Date : November 26 2020, 07:01 PM , By : user3863496
Spring, Hibernate, Blob lazy loading
Spring, Hibernate, Blob lazy loading
will help you I'm confused. Emmanuel Bernard wrote in ANN-418 that @Lob are lazy by default (i.e. you don't even need to use the @Basic(fetch = FetchType.LAZY) annotation). Some users report that lazy loading of a @Lob doesn't work with all drivers/d
TAG : java
Date : November 26 2020, 07:01 PM , By : QiFen
Including Applet in JSP page
Including Applet in JSP page
Hope this helps As shown in this reference, you have to include .class in the code attribute:
TAG : java
Date : November 26 2020, 07:01 PM , By : user3863438
Original object is also changed when values of cloned object are changed
Original object is also changed when values of cloned object are changed
seems to work fine You have obtained what is known as a "shallow copy" of the object. Essentially all of the primitives are copied over, including the object references (the array in this case).What you want is a "deep copy". There are a couple of wa
TAG : java
Date : November 26 2020, 07:01 PM , By : user3863422
Drag and drop + custom drawing in Android
Drag and drop + custom drawing in Android
wish of those help I use drag and drop in my music player application! I give to user the ability to move an song from an playlist to an other playlist. It is really nice and simple for the user. I start the drag event for my view when user make an l
TAG : java
Date : November 26 2020, 07:01 PM , By : user3863345
Creating a time series with jfreechart
Creating a time series with jfreechart
wish help you to fix your issue You might have a look at org.jfree.chart.demo.TimeSeriesChartDemo1, and the associated API documentation. A typical command to run the demo might look like this:
TAG : java
Date : November 26 2020, 07:01 PM , By : Elahe Khani
Hibernate Criteria: Perform JOIN in Subquery/DetachedCriteria
Hibernate Criteria: Perform JOIN in Subquery/DetachedCriteria
will help you I'm running into an issue with adding JOIN's to a subquery using DetachedCriteria. The code looks roughly like this: , Don't you have a typo in your code at the following line :
TAG : java
Date : November 26 2020, 07:01 PM , By : SubhamAgarwal
How to check if my string is equal to null?
How to check if my string is equal to null?
Does that help I want to perform some action ONLY IF my string has a meaningful value. So, I tried this.
TAG : java
Date : November 26 2020, 07:01 PM , By : user3863279
Connect two client sockets
Connect two client sockets
seems to work fine First of all, don't call an accepted client (server-side) its socket a Client Socket. That is very confusing.
TAG : java
Date : November 26 2020, 07:01 PM , By : jsw2015
How to reference a .dll from a .jar file
How to reference a .dll from a .jar file
I wish did fix the issue. java.library.path solution isn't always good: there are many situations where you can't change JVM parameters. Better solutions:1) already mentioned: put DLL in the same directory as JAR, unfortunately it makes usage of such
TAG : java
Date : November 26 2020, 07:01 PM , By : user3860335
Invoke web-services in JSF
Invoke web-services in JSF
To fix this issue The way you access web services from your code (managed beans perhaps?) does not depend on JSF. CXF and Metro are both implementations of JAX-WS, using which you can implement web-service client code.
TAG : java
Date : November 26 2020, 07:01 PM , By : Vash Zelpher
servlet connection to DB
servlet connection to DB
it fixes the issue Initially, after reading books on the subject, I firmly believed that the algorithm for working with a database from a servlet is as follows: create a connection -> connect to the database -> form a request -> send the request to t
TAG : java
Date : November 26 2020, 07:01 PM , By : MiBetaSigma
Can I un-assign (clear) all fields of an instance?
Can I un-assign (clear) all fields of an instance?
hop of those help? I don't get it. How can you programmatically decide how to clear various fields?For normal attributes it can be easy (var = null) but what about composite things or collection? Should it be collection = null, or collection.removeAl
TAG : java
Date : November 25 2020, 07:01 PM , By : user3863249
Java parsing XML document gives "Content not allowed in prolog." error
Java parsing XML document gives "Content not allowed in prolog." error
wish help you to fix your issue Please check the xml file whether it has any junk character like this �.If exists,please use the following syntax to remove that.
TAG : java
Date : November 25 2020, 07:01 PM , By : Antonio Ulian Do Lag
Deploy Play! application as executable jar
Deploy Play! application as executable jar
Any of those help If you have a WAR, you can use the embedded mode of the Winstone servlet container to get a stand-alone executable jar. This is what Hudson does.
TAG : java
Date : November 25 2020, 07:01 PM , By : Devin Abolins
Castor: how to map a simple list of strings?
Castor: how to map a simple list of strings?
like below fixes the issue Is there any reason you are using Marshalling to achieve this? It will have a set way of defining the XML output so that it knows how to recreate the objects when unmarshalling. So if you really want that XML output using m
TAG : java
Date : November 25 2020, 07:01 PM , By : user3863140
Hibernate Transient Extends problem
Hibernate Transient Extends problem
hope this fix your issue When you mark a Parent class as @MappedSuperclass, you are saying
TAG : java
Date : November 25 2020, 07:01 PM , By : user3863122
Posting a JSON array to webservice in Android
Posting a JSON array to webservice in Android
wish help you to fix your issue Appending key/value data to URLs after a '?' is GET not POST.This is how to POST data in Java:
TAG : java
Date : November 25 2020, 07:01 PM , By : Johmz Austria
How to search for duplicate values in a huge text file having around Half Million records
How to search for duplicate values in a huge text file having around Half Million records
will be helpful for those in need Keep a HashMap of {account_number, occurrences} in memory (initially empty), and traverse the file only once, setting or incrementing (in the HashMap) the number of occurrences of each account number you encounter du
TAG : java
Date : November 25 2020, 07:01 PM , By : user3863091
Easy way to get a test file into JUnit
Easy way to get a test file into JUnit
Does that help Can somebody suggest an easy way to get a reference to a file as a String/InputStream/File/etc type object in a junit test class? Obviously I could paste the file (xml in this case) in as a giant String or read it in as a file but is t
TAG : java
Date : November 25 2020, 07:01 PM , By : Syeda Sinchu
cast across classloader?
cast across classloader?
I hope this helps you . Not possible. Class identity consists of the fully qualified name and the class loader.Casting an object to a class with the same name loaded by different classloaders is no different than trying to cast a String to Integer, b
TAG : java
Date : November 25 2020, 07:01 PM , By : NazKidd982
Image manipulation
Image manipulation
Does that help First of all, uDIG, OpenJUMP (not sure about this) cannot process images in a way that ERDAS can. These softwares are great, but they do not have extensive raster funcionality.You need to take a look at GDAL, which covers a bunch of la
TAG : java
Date : November 25 2020, 07:01 PM , By : Sebastian2912
Java - JPA - Generators - @SequenceGenerator
Java - JPA - Generators - @SequenceGenerator
this will help sequenceName is the name of the sequence in the DB. This is how you specify a sequence that already exists in the DB. If you go this route, you have to specify the allocationSize which needs to be the same value that the DB sequence us
TAG : java
Date : November 24 2020, 07:00 PM , By : henry ken
What's a good Java-based Master-Slave communication mechanism?
What's a good Java-based Master-Slave communication mechanism?
hop of those help? Well, I suggest JMS if you are looking for something which is based on Java. It has all the features that you are looking for plus a strong application server such as JBoss. However, another option which is not completely java base
TAG : java
Date : November 24 2020, 07:00 PM , By : crpark98
Design Help/Suggestion required
Design Help/Suggestion required
I wish this help you If you are generating 100,000 challans a year, and you have an 8 digit space, then the math works out as99,999,999 max challan number / 100,000 challans per year = 1,000 years of challans
TAG : java
Date : November 24 2020, 07:00 PM , By : user3862911
NullPointerException in com.sun.tools.jxc.SchemaGenTask
NullPointerException in com.sun.tools.jxc.SchemaGenTask
With these it helps I had this issue because my srcdir was set to the package folder which contained the java files.Changing this to the top level source folder was better, but then schemagen wanted to make a schema for all .java files on my source p
TAG : java
Date : November 24 2020, 07:00 PM , By : user3862897
time required to finish the multithreaded program?
time required to finish the multithreaded program?
like below fixes the issue This depends on the amount of logical processor cores you have and the already running processes and the priority of the threads. The theoretical minimum would be 5 minutes plus the little overhead in starting and controlli
TAG : java
Date : November 24 2020, 07:00 PM , By : Muhammad Izwan
Traditional IO vs memory-mapped
Traditional IO vs memory-mapped
this one helps. What I see with the one benchmark "Stream Read/Write" is: It does not really do stream I/O but seeks to a specific location in the file. This is non-buffered so all the I/Os must be completed from disk (the other streams are using buf
TAG : java
Date : November 24 2020, 07:00 PM , By : user3862863
Using StringBuilder to process csv files to save heap space
Using StringBuilder to process csv files to save heap space
will be helpful for those in need Will the optimized code increase performance of the app? - my question
TAG : java
Date : November 24 2020, 07:00 PM , By : Janson
Response Time is different for mulitiple execution of the application with the same request Performance problem
Response Time is different for mulitiple execution of the application with the same request Performance problem
wish help you to fix your issue My java application functionality is to provide reference data (basically loads lots of data from xml files into hashmap) and hence we request for one such data from the hashmap based on a id and we have such multiple
TAG : java
Date : November 24 2020, 07:00 PM , By : user3862786
Java - Weblogic - JMX : request available free memory on all servers
Java - Weblogic - JMX : request available free memory on all servers
To fix the issue you can do Weblogic 9 has the JVMRuntimeMBean documented here. You'll need to search for weblogic.management.runtime.JVMRuntimeMBean The listed attributes are
TAG : java
Date : November 24 2020, 07:00 PM , By : user3862777
Error: Can't find common super class of
Error: Can't find common super class of
To fix the issue you can do Try adding the option -dontskipnonpubliclibraryclasses to your command line.From the Proguard Manual:
TAG : java
Date : November 24 2020, 07:00 PM , By : Comador
JNI problem when calling a native library that loads another native library
JNI problem when calling a native library that loads another native library
I wish this helpful for you There are really only two ways that one DLL can load another one in Windows - either they do it explicitly using LoadLibrary() or it's implicitly by linking the first DLL against the import library of the second one. You s
TAG : java
Date : November 24 2020, 07:00 PM , By : user3862684
calling Stanford POS Tagger maxentTagger from java program
calling Stanford POS Tagger maxentTagger from java program
I think the issue was by ths following , Well, when you compile or invoke your program you need to add Stanford's JAR file to your classpath, e.g.:
TAG : java
Date : November 24 2020, 07:00 PM , By : user3862679
Notification framework for java
Notification framework for java
around this issue Rmarimon, check out Boomerang Notification Framework from Fuel9. With some basic SQL skills you can quickly develop dynamic notifications (email, twitter, fax etc). Good luck!/M
TAG : java
Date : November 24 2020, 07:00 PM , By : user3862676
hide keyboard in android?
hide keyboard in android?
will help you Change your manifest file:pput it there: (on your especific activity)
TAG : java
Date : November 24 2020, 07:00 PM , By : user3861417
Alternative of JPA
Alternative of JPA
it should still fix some issue IMO the proper way to deal with such issues would be to use a generated internal (typically Long) ID instead of a natural primary key - this eliminates the whole problem. Of course, this requires a modification of your
TAG : java
Date : November 24 2020, 07:00 PM , By : Hugh
How to get Java XP Look and Feel
How to get Java XP Look and Feel
To fix this issue You can't. The XP look and feel, along with several of the other platform-flavoured look-and-feels, depends on native support from the actual platform. It can only be used on XP.
TAG : java
Date : November 24 2020, 07:00 PM , By : user3860783
Remote JMS connection still using localhost
Remote JMS connection still using localhost
I wish this help you I have run across a similar problem while trying to do a remote JNDI lookup for EJBs. The issue was that in my /etc/hosts file the machine name was mapped to local host something like:
TAG : java
Date : November 24 2020, 07:00 PM , By : ME Miller
Java NoClassDefFoundError
Java NoClassDefFoundError
wish help you to fix your issue Note that you can usually refer to the javadoc to determine if an API is available in the version of Java you're using. For example, the javadoc for CharSequence states "Since: 1.4".I generally keep a link to the lates
TAG : java
Date : November 24 2020, 07:00 PM , By : user3854773
Is O(N!*N) an acceptable big oh complexity class or do I remove the constant and just say O(N!)?
Is O(N!*N) an acceptable big oh complexity class or do I remove the constant and just say O(N!)?
seems to work fine See What is O(log(n!)) and O(n!) and Stirling Approximation, which discusses the relationship between O(n!) and O(n^n). This should help you to determine the appropriate big-O when you multiply those by n.The additional n in your p
TAG : java
Date : November 23 2020, 07:00 PM , By : quantalume
Java File URI error?
Java File URI error?
I wish this helpful for you I'm not sure if FileInputStream is designed for reading over the internet .. try new URL(File_Uri).openConnection().getInputStream()
TAG : java
Date : November 23 2020, 07:00 PM , By : user3862600
Using an interface as a constructor parameter in Java?
Using an interface as a constructor parameter in Java?
This might help you How would I be able to accomplish the following: , So that I could declare
TAG : java
Date : November 23 2020, 07:00 PM , By : Peter
Add additional path to exec-maven-plugin
Add additional path to exec-maven-plugin
With these it helps I have some configuration files in a specific directory outside of my source folder. So i defined additonal resources to my pom.xml file.my sample directory structure is:
TAG : java
Date : November 23 2020, 07:00 PM , By : user3862592
Natural Language parsing of an appointment?
Natural Language parsing of an appointment?
it helps some times Extending JChronic may be your best bet. I think, given the responses to this question, it's unlikely that a pre-built library for this exists (though it seems like such a thing could be useful... I'm guessing that the major use-c
TAG : java
Date : November 23 2020, 07:00 PM , By : user3862565
Java: How to tell which fontconfig file my system is currently using?
Java: How to tell which fontconfig file my system is currently using?
wish help you to fix your issue The JRE class sun.awt.FontConfiguration already has logging for this, you just need to enable it. Add this option to Java -Dsun.java2d.debugfonts=true Edit jre/lib/logging.properties
TAG : java
Date : November 23 2020, 07:00 PM , By : user3862558
How to create notification icon badge on Android apps (like iPhone)
How to create notification icon badge on Android apps (like iPhone)
wish helps you I am very new to programming and would like to know what is the best way to go about creating a notification icon badge similar to the ones on the iPhone apps. This would be basically for creating a badge for the notifications that end
TAG : java
Date : November 23 2020, 07:00 PM , By : Netssi
Interfaces with hibernate annotations
Interfaces with hibernate annotations
To fix this issue You can map interfaces in Hibernate, as part of inheritance hierarchies. This is quite surely possible with XML mapping, as it is described in Chapter 9 of the Hibernate reference, among others.Annotation based mapping is a differen
TAG : java
Date : November 23 2020, 07:00 PM , By : user3862518
Getting ConnectionTimeoutException with the host did not accept the connection within timeout
Getting ConnectionTimeoutException with the host did not accept the connection within timeout
I think the issue was by ths following , Your program will get a ConnectionTimeoutException whenever the server side does not "exist". A timeout of 10 seconds (10000 ms) is sufficient to work in most cases to connect between any processes even when l
TAG : java
Date : November 23 2020, 07:00 PM , By : jumanji
How to get all property names of a Groovy class?
How to get all property names of a Groovy class?
this one helps. I am using groovy compiler 2.4 I get a java.util.LinkedHashMap containing all the properties and their values returned by calling getProperties() on a groovy object.
TAG : java
Date : November 23 2020, 07:00 PM , By : user3862491
Java Netscape LDAP Remove One Attribute
Java Netscape LDAP Remove One Attribute
hope this fix your issue You need to call modify method on LDAPConnection class :-)From the javadocs:
TAG : java
Date : November 23 2020, 07:00 PM , By : CharacterTD_Sage
A simple two column layout with Swing
A simple two column layout with Swing
wish helps you There is no guarantee in Swing that the preferred size is respected. This depends on the layout manager of the container. If the container uses a BorderLayout, you can add the SidebarPanel using:
TAG : java
Date : November 23 2020, 07:00 PM , By : user3862449
Making a Linked list using Generics
Making a Linked list using Generics
I wish this helpful for you A generic linked list class usually is implemented using a generic helper class to represent a node of the list. This Node class would contain an element of type T (where T is the generic parameter) and a reference to the
TAG : java
Date : November 23 2020, 07:00 PM , By : Max Alley
how to handle result set data
how to handle result set data
it fixes the issue You can use Statement.setFetchSize() to control the number of records fetched into memory when you iterate through result set. But in general I think it depends on JDBC driver on how it handles that setting and how it stores fetche
TAG : java
Date : November 23 2020, 07:00 PM , By : user3862434
Cloning java ArrayList and preventing it from modifications
Cloning java ArrayList and preventing it from modifications
Hope that helps You can use Collections.unmodifiableList((List) originalList.clone())
TAG : java
Date : November 23 2020, 07:00 PM , By : Harutyun Shamyan
Java How to call method of grand parents?
Java How to call method of grand parents?
With these it helps You can't. This is deliberate.Class B provides an interface (as in the concept, not the Java keyword) to subclasses. It has elected not to give direct access to the functionality of A.myMethod. If you require B to provide that fun
TAG : java
Date : November 23 2020, 07:00 PM , By : user3862401
running jython bytecode using java
running jython bytecode using java
wish of those help It looks like I'm missing something. , Here's what works for me:test_p.py:
TAG : java
Date : November 23 2020, 07:00 PM , By : ebaumeis
get content from website with utf8 format
get content from website with utf8 format
With these it helps The problem might be that your console or your System.out are not UTF-8. Try writing this to a file instead Set the console stream via System.setOut(..)
TAG : java
Date : November 23 2020, 07:00 PM , By : user3862331

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