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JAVA QUESTIONS

Is MongoDB a valid alternative to relational db + lucene?
Is MongoDB a valid alternative to relational db + lucene?
I hope this helps . Technically you can do full text search with MongoDB, but you're missing out on a lot that a full text search provider has to offer. I love MongoDB, but I'd couple it with a full text search provider (such as Lucene or Sphinx) if
TAG : java
Date : November 16 2020, 07:01 PM , By : MarcusK1
Differences between 2 objects with Java reflection : how?
Differences between 2 objects with Java reflection : how?
help you fix your problem It's a pretty daunting problem to try and solve generically. You might consider pairing a Visitor pattern, which allows you to add functionality to a graph of objects, with a Chain of Responsibility pattern, which allows you
TAG : java
Date : November 16 2020, 07:01 PM , By : user3860306
How to get the whole entity from get request using httpcore library
How to get the whole entity from get request using httpcore library
Hope that helps I'm using Apache Http-core library but i'm having a problem with the entity of the httpResponse message. It seems like sometimes, when I receive a Http response, with multiple TCP packets, the last packet is discarded, for some reason
TAG : java
Date : November 16 2020, 07:01 PM , By : Erika
jax-ws on glassfish3 init method
jax-ws on glassfish3 init method
With these it helps How can I configure init method for jaxws service (like i can do for the servlets for example)
TAG : java
Date : November 16 2020, 07:01 PM , By : user3860237
Can getAttribute() method of Tomcat ServletContext implementation be called without synchronization?
Can getAttribute() method of Tomcat ServletContext implementation be called without synchronization?
I wish this help you The primary implementation of ServletContext in Tomcat is the ApplicationContext class. If you look at the linked resource, you will see that the attributes are stored in a java.util.concurrent.ConcurrentHashMap instance. So, for
TAG : java
Date : November 16 2020, 07:01 PM , By : user3860221
JAXB: @XmlTransient on third-party or external super class
JAXB: @XmlTransient on third-party or external super class
it should still fix some issue OK, this was a pain in the you-know-what. Finally, after sifting through many a blog postings, here's what I did,added a package-info.java class in the 'third-party class' package like this,
TAG : java
Date : November 16 2020, 07:01 PM , By : Xiaosi Lee
Spring - Redirect after POST (even with validation errors)
Spring - Redirect after POST (even with validation errors)
To fix the issue you can do Since Spring 3.1 you can use RedirectAttributes. Add the attributes that you want to have available before doing the redirect. Add both, the BindingResult and the object that you are using to validate, in this case Registe
TAG : java
Date : November 16 2020, 07:01 PM , By : user19550
Java mail encoding non english characters
Java mail encoding non english characters
it helps some times Using the code below i can send an email written in non-english and although the subject appears correctly the body appears as gibberish. , Try:
TAG : java
Date : November 16 2020, 07:01 PM , By : user3860176
Date query with Hibernate on Timestamp Column in PostgreSQL
Date query with Hibernate on Timestamp Column in PostgreSQL
hope this fix your issue , I would like to know if there is way to match only the date part of the timestamp column.
TAG : java
Date : November 16 2020, 07:01 PM , By : user3860175
Sort String "13,5,8,4,2,1,9" in ascending order 1,2,4,5,8,9,13 in Java
Sort String "13,5,8,4,2,1,9" in ascending order 1,2,4,5,8,9,13 in Java
wish of those help Split the string by commas Parse each substring into an integer Sort the resulting collection If you need the result to be a string (it's not clear), convert each integer back into a string and join them together with commas. If an
TAG : java
Date : November 16 2020, 07:01 PM , By : Gábor Pusztafi
Fatal error by Java runtime environment
Fatal error by Java runtime environment
this one helps. I got the same problem, but with alot of googling I found the answer! See this pageQuote from the link:
TAG : java
Date : November 16 2020, 07:01 PM , By : user3860144
Using Hibernate outside the context of Tomcat
Using Hibernate outside the context of Tomcat
I hope this helps . I've found it be very useful even when using pure SQL (no mappings) because it handles query parameters and type conversions better than straight JDBC.Here is a simple self-contained Hibernate class that assumes a table called Per
TAG : java
Date : November 16 2020, 07:01 PM , By : user3860097
Failed to resolve firebase-ui-auth
Failed to resolve firebase-ui-auth
this will help When I use implementation 'com.firebase.firebase-ui-auth:4.3.1' it pops up an error I even tried to change it to 3.3.1 then it shows a failure that it could no find the package , Change this:
TAG : java
Date : November 15 2020, 07:01 PM , By : Pascal Boucher
Object Lock in Multithreading
Object Lock in Multithreading
wish of those help Each of your threads creates a new instance of PrintTable. And the code in PrintTable is synchronized on this.This means that the two instances are synchronized on two different locks.
TAG : java
Date : November 15 2020, 07:01 PM , By : 谭淇蔚
Calling a method from a one class to another
Calling a method from a one class to another
wish help you to fix your issue Normally you'd invoke methods in another class by instantiating the class and then calling the method. For instance, if the class that the method was in was named DatabaseUtils, you'd do the following:
TAG : java
Date : November 15 2020, 07:01 PM , By : janyu
Java how to Convert String Date format
Java how to Convert String Date format
should help you out You can use DateTimeFormatter like this :
TAG : java
Date : November 15 2020, 07:01 PM , By : Zack Bowling
Eclipse won't run current class
Eclipse won't run current class
it helps some times You can try right clicking on java file(Balloon) and select Run As java application(it will show this option if you have main method in class).It did not work then clear the workspace and try to import the project once again. ther
TAG : java
Date : November 15 2020, 07:01 PM , By : Kareem Elsherpiny
CheckBox menu item Decrypt in JAVA GUI
CheckBox menu item Decrypt in JAVA GUI
wish help you to fix your issue well to start with, have you created a gui with a JCheckbox and a JToggleButton? If so start by getting your gui created, i'm assuming you are using swing??Then add an action listener to the checkbox and the togglebutt
TAG : java
Date : November 15 2020, 07:01 PM , By : user3860087
Updating the Jpanel of a class
Updating the Jpanel of a class
may help you . As long as you have a reference to the JPanel, you can add whatever GUI-element you want, by calling add(JComponent comp) on the JPanel.So, you can do something like this:
TAG : java
Date : November 15 2020, 07:01 PM , By : user3860060
catDog string problem at Codingbat.com
catDog string problem at Codingbat.com
will be helpful for those in need While you are pretty close to a solution, there are a few critical problems in your code:
TAG : java
Date : November 15 2020, 07:01 PM , By : user3860030
how do I get eclipse to use a different compiler version for Java?
how do I get eclipse to use a different compiler version for Java?
To fix the issue you can do From the menu bar: Project -> Properties -> Java CompilerEnable project specific settings (checked) Uncheck "use Compliance from execution environment '.... Select the desired "compiler compliance level"
TAG : java
Date : November 15 2020, 07:01 PM , By : user3860026
Multiple Components in a JTree Node Renderer & Node Editor
Multiple Components in a JTree Node Renderer & Node Editor
help you fix your problem You have forgotten to tell the JTree via JTree.cancelEditing() or JTree.stopEditing() that an editing session is over. Second, you should only show the JComboBox in an editing session. Use a normal JLabel for standard render
TAG : java
Date : November 15 2020, 07:01 PM , By : sakaeru
Hibernate annotations cascading doesn't work
Hibernate annotations cascading doesn't work
it should still fix some issue I'd suggest getting rid of the @Cascade annotation, unless you need delete-orphan.use only cascade = {CascadeType.MERGE, CascadeType.PERSIST}
TAG : java
Date : November 15 2020, 07:01 PM , By : Dips
Javamail performance
Javamail performance
fixed the issue. Will look into that further I believe that Gmail throttles the IMAP message reads to one every second or so. You might be able to speed it up with multiple IMAP connections.
TAG : java
Date : November 15 2020, 07:01 PM , By : Zain Ul Abideen
JComponent undock effect
JComponent undock effect
This might help you Maybe you should take a look at Java docking frameworks. i've recently answered such a question : How to create docking panel in Java? I would suggest you take a look at those docking frameworks, which may directly answer your nee
TAG : java
Date : November 15 2020, 07:01 PM , By : Hugo
How to keep track of the change in date in Java
How to keep track of the change in date in Java
Hope this helps What you're looking for is a scheduler. Quartz is probably the most commonly used scheduler in the Java world, though Spring has some interesting scheduling features if you are already using that framework.Whichever scheduler you choo
TAG : java
Date : November 15 2020, 07:01 PM , By : Philipp Keller
Mayan calendar in Java
Mayan calendar in Java
I hope this helps you . How can I use the Maya calendar in Java? , Has your calendar run out now? :-)
TAG : java
Date : November 15 2020, 07:01 PM , By : Gordon
How to find the MAC address of a 'shutdown' system on local lan (is it possible?)
How to find the MAC address of a 'shutdown' system on local lan (is it possible?)
I think the issue was by ths following , Once the system is shutdown your best bet to finding the MAC address is looking for stickers somewhere on the case!
TAG : java
Date : November 15 2020, 07:01 PM , By : Vivek K S
face detection through webcam using java in ubuntu linux
face detection through webcam using java in ubuntu linux
To fix this issue OpenCV is almost a standard in computer vision. It works on both unix like and windows platforms - http://opencv.willowgarage.com/wiki/. Follow the installation manual and the basic tutorials to get started.
TAG : java
Date : November 15 2020, 07:01 PM , By : user3859814
Is it a good idea to implement chatroom like functionality via pubsubhub
Is it a good idea to implement chatroom like functionality via pubsubhub
Does that help Actually I want something between chatroom and stackoverflow ie users can ask questions and in my application generally many users will be on the same webpage now others can see the question in realtime and answer the same in realtime
TAG : java
Date : November 15 2020, 07:01 PM , By : user3859798
Float to Long conversion
Float to Long conversion
I wish did fix the issue. Quote from Java Puzzlers: Traps, Pitfalls, and Corner Cases book:
TAG : java
Date : November 14 2020, 07:01 PM , By : 조은비
Want to change Activity to Fragment
Want to change Activity to Fragment
This might help you I want to change my activity to fragment. my code is given below. help would be appreciated. I have spend two days without any success. I have modified a lot my above code but unable to solve this. Last five lines are confusing me
TAG : java
Date : November 14 2020, 07:01 PM , By : Goutham
Split string with this regex: [\\dc]+
Split string with this regex: [\\dc]+
I wish this helpful for you This regular expression will split the test by any combination of digits and character 'c' repeated at least once: \\d - any digit [0-9] c - character 'c' []+ - characters inside of this set can occur at least once
TAG : java
Date : November 14 2020, 07:01 PM , By : Chere
Equivalent of public static final fields in Scala
Equivalent of public static final fields in Scala
around this issue I'm learning Scala, and I can't figure out how to best express this simple Java class in Scala:
TAG : java
Date : November 14 2020, 07:01 PM , By : may
Loading DLL in Java - Eclipse - JNI
Loading DLL in Java - Eclipse - JNI
Hope this helps Where you specify the DLL filename in the library path, omit that. Additionally, your System.loadLibrary call should just be 'mydll'. I can tell you (from experience) that if you put the DLL in the root of your project in Eclipse (i.e
TAG : java
Date : November 14 2020, 07:01 PM , By : user3859771
chess board in java
chess board in java
I wish did fix the issue. I would like submitting a simple chess board drawing example using Unicode characters. There 3 classes involved into this tiny project.ChessLabel.java
TAG : java
Date : November 14 2020, 07:01 PM , By : Ankit
How do you validate the format and values of EditTextPreference entered in Android 2.1?
How do you validate the format and values of EditTextPreference entered in Android 2.1?
like below fixes the issue Does anyone have sample code to validate user entered text in preferences? For example, I have a EditTextPreference for user to enter an email address. I'd like to validate the format of email address entered and pop up an
TAG : java
Date : November 14 2020, 07:01 PM , By : dweightC
How to sort an arraylist of objects by a property?
How to sort an arraylist of objects by a property?
this will help You can use Collections.sort with a custom Comparator.
TAG : java
Date : November 14 2020, 07:01 PM , By : maciok
Does Hibernate 3.5.0-CR-2 release support JPA2.0
Does Hibernate 3.5.0-CR-2 release support JPA2.0
it fixes the issue The release notes for 3.5-CR1 claim full JPA 2.0 compliance:
TAG : java
Date : November 14 2020, 07:01 PM , By : Qamar Sheeraz
Understanding character encoding in typical Java web app
Understanding character encoding in typical Java web app
will be helpful for those in need Instead of UTF-16, think of 'internal representation' of your string. A string in Java is some sort of characters, you don't care which encoding is used internally. Encoding becomes relevant, if you interact with the
TAG : java
Date : November 14 2020, 07:01 PM , By : HODA
Adding file names to an array list in java
Adding file names to an array list in java
will be helpful for those in need Here's a solution that uses java.io.File.list(FilenameFilter). It keeps the .txt suffix; you can strip these easily if you really need to.
TAG : java
Date : November 14 2020, 07:01 PM , By : Akshay
any lib / api for filling in the field in microsoft doc?
any lib / api for filling in the field in microsoft doc?
this will help Apache POI - the Java API for Microsoft Documents
TAG : java
Date : November 14 2020, 07:01 PM , By : ManiChandraKant
fire and forget compared to http request
fire and forget compared to http request
Any of those help I think you're misunderstanding networking in general. There's positively no reason that a HTTP GET would have to be any slower than anything else, and if HTTP takes advantage of keep alives it's faster that most options.JMX isn't a
TAG : java
Date : November 14 2020, 07:01 PM , By : Lupus
How thread-safe is enum in java?
How thread-safe is enum in java?
Hope that helps As @Mike is saying, creation of enum is guaranteed to be thread safe. However, methods that you add to an enum class do not carry any thread safety guarantee. In particular, the method leaveTheBuilding may be executed, concurrently, b
TAG : java
Date : November 14 2020, 07:01 PM , By : user3859569
multiple keys and values with google-collections
multiple keys and values with google-collections
may help you . I would like use google-collection in order to save the following file in a Hash with multiple keys and values , You need to define Key and Value classes, so you can define
TAG : java
Date : November 14 2020, 07:01 PM , By : Ryan Rifqi Arista
Can't run a web application with gwtext
Can't run a web application with gwtext
I hope this helps . You can get the "x.jar will not be available on the server's classpath" if you are referencing the jar via Eclipse's "Java Build Path" outside of the war/WEB-INF/lib directory--and it looks like from the error that you are. Copy g
TAG : java
Date : November 14 2020, 07:01 PM , By : jonas.curativo
"Low level" project using Java
"Low level" project using Java
I wish did fix the issue. I'm wondering if it would make sense to do some low level or OS stuff (a project) using Java. Reason why I ask is because I would like to expand my knowledge in Java and I'm into doing stuff like file compressor, bulk file r
TAG : java
Date : November 14 2020, 07:01 PM , By : Surya Teja Gutta
Filling combobox from database by using hibernate in Java
Filling combobox from database by using hibernate in Java
it fixes the issue I don't use Hibernate, but given a JPA entity named Customer and a JPA controller named CustomerJpaController, you can do something like this.Update: Code updated to reflect a switch to EclipseLink (JPA 2.1) as the persistence libr
TAG : java
Date : November 14 2020, 07:01 PM , By : Sergio Varela
Java projects without swing
Java projects without swing
it helps some times SWT is a popular GUI library (used in projects such as Eclipse IDE and other standalone projects) which uses native windowing components such as Win32 on Windows and GTK+ on Linux. It achieves this through an abstraction layer wit
TAG : java
Date : November 14 2020, 07:01 PM , By : user3859518
multithreading scheduling related java
multithreading scheduling related java
this will help There's no synchronization shown in your code - both threads will run. Now the console access is probably synchronized somewhere, but basically I'd expect to see something like:
TAG : java
Date : November 14 2020, 07:01 PM , By : Govardhan
JTable without a header
JTable without a header
seems to work fine I don't think that you want your Sudoku to scroll, so the easiest way should be not to put your table into a JScrollPane, which is responsible for displaying the header:
TAG : java
Date : November 14 2020, 07:01 PM , By : Qutaiba
Logging Level log4j
Logging Level log4j
this one helps. That depends. If you can mitigate the nullpointer somehow without having bigger problems, you'll simply log it as warn. If you cannot mitigate, you'll log it as error and possibly go into a rejecting loop.Example:
TAG : java
Date : November 13 2020, 07:01 PM , By : Bijou
Failed to convert value of type 'java.lang.String' to required type 'java.time.LocalDate';
Failed to convert value of type 'java.lang.String' to required type 'java.time.LocalDate';
like below fixes the issue 2019-3-29 is a bad input and the 400 status code is accurate. See the DateTimeFormat.ISODATE documentation:
TAG : java
Date : November 13 2020, 07:01 PM , By : Nicholas Nicolaou
How can I have multiple definitions of main?
How can I have multiple definitions of main?
Does that help Most of my C library code can be compiled with -DTEST to expose the main() (and often some auxilliary functions too) in the source file with the implementation. So if I have a set of functions declared in source.h and defined in source
TAG : java
Date : November 13 2020, 07:01 PM , By : Sonali Agarwal
Why can java nio only write bytes?
Why can java nio only write bytes?
I hope this helps . Another method, Files.write(Path,Iterable,Charset,OpenOption...), can be used to write CharSequences directly (a String is a CharSequence).
TAG : java
Date : November 13 2020, 07:01 PM , By : Alex
How to find selected node in Tree?
How to find selected node in Tree?
With these it helps If your tree only accept single selection then it should be possible with:
TAG : java
Date : November 13 2020, 07:01 PM , By : Ronnie
where is the best palce to count the lazy load property using JPA
where is the best palce to count the lazy load property using JPA
I wish this helpful for you If using extensions is not excluded, you could maybe use @LazyCollection with the EXTRA option:
TAG : java
Date : November 13 2020, 07:01 PM , By : congqing
Disable jmx in activemq network of brokers (spring, xbean)
Disable jmx in activemq network of brokers (spring, xbean)
I hope this helps you . Since I've struggled a lot with this problem, I am posting my solution. Disabling jmx in an activemq network of brokers removes race conditions about the registration of the jmx connector. When starting multiple activemq serve
TAG : java
Date : November 13 2020, 07:01 PM , By : Rankir Doshi
Closures in Java 7
Closures in Java 7
this one helps. Yes, closures were include to release plan of java 7 (and it was the most significant reason to delay release from winter to autumn (expected in September 2010)). The latest news could be found at Project Lambda. You may also be inter
TAG : java
Date : November 13 2020, 07:01 PM , By : user3859432
Including more than two Panels in a JFrame?
Including more than two Panels in a JFrame?
hope this fix your issue Assuming you want two panels added to a single frame:Set a layout for your parent JFrame and add the two panels. Something like the following
TAG : java
Date : November 13 2020, 07:01 PM , By : user3859416

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