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JAVA QUESTIONS

AssertionError: Unexpected schema version 0: Unexpected schema version 0
AssertionError: Unexpected schema version 0: Unexpected schema version 0
To fix this issue This issue was filed recently this year. Take a look here issues androidTrying updating your IDE and try disabling assertions in the IDE (in the idea.properties file).
TAG : java
Date : November 22 2020, 10:56 AM , By : user2956393
getResourceAsStream always returning null (Google App Engine)
getResourceAsStream always returning null (Google App Engine)
I think the issue was by ths following , I am having a bit of a problem with my code and that it always throws NullPointerException: , The answer is to do this:
TAG : java
Date : November 22 2020, 10:54 AM , By : user2956368
In Android Native app failed to create a client socket. Error code:14 Unable to create socket: Permission denied
In Android Native app failed to create a client socket. Error code:14 Unable to create socket: Permission denied
I wish this help you should have added "android.permission.INTERNET" and "android.permission.ACCESS_NETWORK_STATE" android permissions in the AndroidManifest.xml.
TAG : java
Date : November 22 2020, 10:54 AM , By : user2956366
Error while connecting my login page with the JDBC code
Error while connecting my login page with the JDBC code
hope this fix your issue Your expectations don't match realty, the method you are calling is declared as returning boolean
TAG : java
Date : November 22 2020, 10:54 AM , By : user2956350
Host java web service with jelastic
Host java web service with jelastic
will help you Do you want to connect to the specific port in your environment which differs from 80, 8080? If so - you should have an external IP address (Public IPv4) in your environment.
TAG : java
Date : November 22 2020, 10:54 AM , By : user2956348
Android SDK error
Android SDK error
I hope this helps you . You have redundant environmental variables !! only PATH and JAVA_HOME are required.. JDK_HOME, JAVA_PATH are not required.. further more if you have eclipse and ADT, open eclipse go to 'window' then select 'android sdk manager
TAG : java
Date : November 22 2020, 10:54 AM , By : user2956321
run process (command) on a remote linux machine from java
run process (command) on a remote linux machine from java
To fix the issue you can do I want to run a command in another server from my java code. , Yes you can, one of the way:
TAG : java
Date : November 22 2020, 10:54 AM , By : Annie
Hbase scan is returning deleted rows
Hbase scan is returning deleted rows
I wish this help you It has nothing to do with major compactions (they run every ~24 hours by default). When you delete a row the deleted data will be ignored by HBase until finally removed (on major_compactions). Just be noticed that if you don't ha
TAG : java
Date : November 22 2020, 10:54 AM , By : user2956298
C++ - Alternative to Integer.parseInt() and String.valueOf()
C++ - Alternative to Integer.parseInt() and String.valueOf()
Does that help For Integer.parseInt you can use std::stoi, std::istringstream, sscanf, atoi etc.For String.valueOf() alternatives, you can std::ostringstream, sprintf, std::tostring etc.
TAG : java
Date : November 22 2020, 10:54 AM , By : Saied Attallah
Strategy to avoid ClassCastException in Java
Strategy to avoid ClassCastException in Java
I hope this helps you . instanceof is the Java equivalent of C's is. There's no direct equivalent of as; you have to do the downcast after checking.
TAG : java
Date : November 22 2020, 10:54 AM , By : hivefans
FreeMarker template error! in struts2
FreeMarker template error! in struts2
I wish this help you The exception is telling you exactly where to look for the error:
TAG : java
Date : November 22 2020, 10:54 AM , By : user2956247
What is the terminology for this Java code structure?
What is the terminology for this Java code structure?
wish of those help This is called as the Anonymous class.This is from the Oracle docs:
TAG : java
Date : November 22 2020, 10:54 AM , By : Sinpatogo
Cannot Access Variable From Another Class
Cannot Access Variable From Another Class
like below fixes the issue displacement is a local variable in your constructor. Therefore it won't be accessible outside the constructor.If you want it to be accessible to other methods in the class, move it out of the constructor and make it an ins
TAG : java
Date : November 22 2020, 10:54 AM , By : user2956240
Unable to switch between frames in WebDriver
Unable to switch between frames in WebDriver
should help you out Before switching to resultsFrame try to switch to defaultContent or your main frame and then switch to resultsFrame. The thing is webdriver searches the frame in current context. So under searchFrame it will never find the results
TAG : java
Date : November 22 2020, 10:54 AM , By : user2956236
Java in Android, Problems in array
Java in Android, Problems in array
I wish this helpful for you I'm trying to use the array in my android program. , The statement
TAG : java
Date : November 22 2020, 10:54 AM , By : iY-D
Java program stop work
Java program stop work
this one helps. 10mb is a very small amount of memory, and before I go any further I want to make it clear that it is not enough memory. The permanent space is taking up 55.08% of that amount. Old generation is taking up 34.90%, and the Eden space is
TAG : java
Date : November 22 2020, 10:54 AM , By : user2956194
i set my array now i have to get the entire array (Java)
i set my array now i have to get the entire array (Java)
hop of those help? Assuming getFoo() returns an the array foo (which seems to be the case from your for loop statement), you can access index x of foo with:
TAG : java
Date : November 22 2020, 10:54 AM , By : user2956190
Getting content of function (Between curly braces)
Getting content of function (Between curly braces)
this one helps. I have a class with "n" complex functions like this:
TAG : java
Date : November 22 2020, 10:54 AM , By : Rasith
Java Singleton Methods not Working
Java Singleton Methods not Working
To fix this issue Your issue is that method calls in Java have to be in a method. So the issue you're having actually has little to do with the Singleton pattern at all, it's that you're trying to make a call in the body of a class, rather than a met
TAG : java
Date : November 22 2020, 10:54 AM , By : user2956150
Android Volley imageloader with % progress while downloading images
Android Volley imageloader with % progress while downloading images
seems to work fine In your situation, you made loading an image as download a file, ImageLoader basically perform a single-session request, does not fulfill your purpose. if you still looking for a library that advantage by Volley but offered a file
TAG : java
Date : November 22 2020, 10:54 AM , By : user2956145
Error when to compile my theme with vaadin 7.3 and valo theme
Error when to compile my theme with vaadin 7.3 and valo theme
I hope this helps . I'm developing a vaadin application which used vaadin v7.2. Now it is updated to v7.3.7 and used the new valo theme with my custom styles. When compiling the whole project using mvn clean install the theme getting compile perfectl
TAG : java
Date : November 22 2020, 10:54 AM , By : user2956118
Is there a way to remove frame decoration without re-opening it?
Is there a way to remove frame decoration without re-opening it?
hop of those help? The method setUndecorated() can only be used if the frame is not displayable. What you could do is make your frame not displayable by calling dispose().Your method setFullScreen() could look like this:
TAG : java
Date : November 22 2020, 10:48 AM , By : user2955986
Android CountDownTimer Class Lagging Main Thread
Android CountDownTimer Class Lagging Main Thread
Hope that helps I decided to take a different approach which has served my purposes very well. No lag or thread issues and can easily be restarted over and over. Hope this helps someone out.
TAG : java
Date : November 22 2020, 10:48 AM , By : user2955982
Java Generics method code duplication issue regarding primitive arrays
Java Generics method code duplication issue regarding primitive arrays
it fixes the issue You can avoid (most of) the duplication by using Array class. But it's not pretty: your constructor parameter would have do be of type Object, and you'd have to just trust your caller to pass the actual array there, and not a Socke
TAG : java
Date : November 22 2020, 10:48 AM , By : user2955981
Misunderstanding of Instances and Declarations
Misunderstanding of Instances and Declarations
I wish this help you The line public static Board board; declares a variable that can refer to a board. In a way, think of it like a box - you created an empty box. It has nothing in it, but you now have the ability to put something in that box.Each
TAG : java
Date : November 22 2020, 10:48 AM , By : user2955971
using enum list as parameter in HQL query
using enum list as parameter in HQL query
it should still fix some issue I have an entity called Band with a attribute List genres, Genres is a ENUM with the following values: ALTERNATIVE_ROCK("Alternative Rock"), CLASSIC_ROCK("Classic Rock"), HARD_ROCK("Hard Rock"), HEAVY_METAL("Heavy Metal
TAG : java
Date : November 22 2020, 10:48 AM , By : user2955941
Using Libgdx seek behaviour with box2d?
Using Libgdx seek behaviour with box2d?
wish of those help SteeringAcceleration is just a class that holds the linear and angular acceleration that the seek behavior has calculated.
TAG : java
Date : November 22 2020, 10:48 AM , By : user2955910
Complexity of coin algorithm
Complexity of coin algorithm
it fixes the issue I thinky the code you provided is kind of chaotic. So this post is more about the conceptual algorithm instead of the real algorithm. This can differ a bit since for instance insertion in an ArrayList is not O(1), but I'm confident
TAG : java
Date : November 22 2020, 10:48 AM , By : user2955906
Hibernate 4 upgrade, COMMIT not being issued
Hibernate 4 upgrade, COMMIT not being issued
should help you out So it turns out I was doing something incorrect (surprise). There's a good reason that the TransactionState was showing as TRANSACTION_IDLE and not issuing a commit.I had seen in multiple places on the internetz where people were
TAG : java
Date : November 22 2020, 10:48 AM , By : SmotAl
Mocking Application Variants in Unit Test for Custom Gradle Plugin That Depends On Android Plugin
Mocking Application Variants in Unit Test for Custom Gradle Plugin That Depends On Android Plugin
fixed the issue. Will look into that further When unit testing plugins using ProjectBuilder it's typically necessary to explicitly call Project.evaluate() in cases where plugins utilize Project.afterEvaluate(). Add the following just before you asser
TAG : java
Date : November 22 2020, 10:48 AM , By : user2955889
The costs of streams and closures in Java 8
The costs of streams and closures in Java 8
To fix the issue you can do The cost you see here is not associated with the "closures" at all but with the cost of Stream initialization.Let's take your three sample codes:
TAG : java
Date : November 22 2020, 10:48 AM , By : user2955879
why getNamespaceURI() always return null?
why getNamespaceURI() always return null?
Does that help From this, you need to set a flag factory.setNamespaceAware(true), like this:
TAG : java
Date : November 22 2020, 10:48 AM , By : user2955844
Edge Detection code for BufferedImage
Edge Detection code for BufferedImage
Hope this helps For anyone interested , i solved this problem with the use of a Stack.pre-populate the stack with the order of directions to take. Start moving in a direction. if it can move direction is popped from stack else Hit a border push that
TAG : java
Date : November 22 2020, 10:48 AM , By : jckhmmr
Can't copy my object and change values
Can't copy my object and change values
I wish did fix the issue. I'm having problems making a copy of an object to use and change values for that copy, instead it changes the values for both of my objects. Code for the object.
TAG : java
Date : November 22 2020, 10:48 AM , By : user2955823
Type variable vs instanceof for identification
Type variable vs instanceof for identification
hope this fix your issue Both are bad. Define the method in A, override the method in X and Y and call that method on the object passed in. You're throwing away polymorphism, a cornerstone of object oriented programming.
TAG : java
Date : November 22 2020, 10:48 AM , By : alexxxnf
Android - twitter4j Proguard error
Android - twitter4j Proguard error
hope this fix your issue Looks like there were a number of issues. Got it sorted in the end. In case it helps anyone else, here is my full proguard-project.txt file:
TAG : java
Date : November 22 2020, 10:48 AM , By : john
Creating a Basic Undo Manager for Integer Values
Creating a Basic Undo Manager for Integer Values
wish help you to fix your issue add action to the stack and remove it for "undo". example of command pattern: https://berther.io/2004/09/16/using-the-command-pattern-for-undo-functionality
TAG : java
Date : November 22 2020, 10:48 AM , By : cuu
Generating a 4096-bit RSA key is way slower than 2048-bit using Jsch
Generating a 4096-bit RSA key is way slower than 2048-bit using Jsch
This might help you Generating an RSA key requires finding two large, random prime numbers that satisfy certain criteria. Finding such primes is essentially a matter of picking random numbers and then checking if they are prime or not by performing c
TAG : java
Date : November 22 2020, 10:48 AM , By : user2955745
JavaFX Gradle build error, java.util.zip.ZipException: duplicate entry: META-INF/LICENSE
JavaFX Gradle build error, java.util.zip.ZipException: duplicate entry: META-INF/LICENSE
it fixes the issue Based on Mark Vieira's suggestion and a little digging for live examples, I modified my build.gradle file's jar task to read as follows:
TAG : java
Date : November 22 2020, 10:40 AM , By : DeBil
json to HashMap<Date, Integer>
json to HashMap<Date, Integer>
around this issue I have to convert json Strings like this , If your keys are unique – you can use the next code
TAG : java
Date : November 22 2020, 10:40 AM , By : GMR
Java REST Partial Update of boolean Fields
Java REST Partial Update of boolean Fields
hope this fix your issue I think I found the solution. Instead of using Event in Post argument, it is better to use JsonObject:
TAG : java
Date : November 22 2020, 10:40 AM , By : user2955612
Range of values based on key values
Range of values based on key values
it helps some times I'm trying to implement a method of searching through a large amount of 2D points for those that match a certain range. I'm thinking of creating HashMaps for and but I'm wondering is HashMap good for doing this, because I will be
TAG : java
Date : November 22 2020, 10:40 AM , By : user2955604
Java, Simple JUnit test. Set value to zero
Java, Simple JUnit test. Set value to zero
Does that help , Here:
TAG : java
Date : November 22 2020, 10:40 AM , By : user2955591
Returning values from lambdas expressions?
Returning values from lambdas expressions?
it should still fix some issue As suggested, if you only need to determine if any of the interfaces return true from `clicked() then use:
TAG : java
Date : November 22 2020, 10:40 AM , By : user2955579
Why does the JVM claim my PNG does not exist?
Why does the JVM claim my PNG does not exist?
wish help you to fix your issue I am trying to set the upper-left image on a JFrame. However, it claims my PNG file is nonexistant. I set the icon with , Why is this happening?
TAG : java
Date : November 22 2020, 10:40 AM , By : user2955561
Editable multimap index
Editable multimap index
I hope this helps . You can create a method that return a mutable Multimap, like the index function, like this:
TAG : java
Date : November 22 2020, 10:40 AM , By : user2955505
I'm getting NullPointerException
I'm getting NullPointerException
wish help you to fix your issue Make sure you initialize the matched_file_names list before using it. This should solve your issue.
TAG : java
Date : November 22 2020, 10:40 AM , By : user2955490
Separating array in other arrays
Separating array in other arrays
I wish did fix the issue. I have an array that I need to split in different arrays. I have an array of Strings and need to split it in different pages (different arrays). , The error probably occurs in this line:
TAG : java
Date : November 22 2020, 10:40 AM , By : user2955489
Use of "hasNext()" Statement
Use of "hasNext()" Statement
help you fix your problem hasNext() tells you whether there are more elements to be read from the stream. In this case, the call will block until there is user input.There are three scenarios:
TAG : java
Date : November 22 2020, 10:40 AM , By : user2955476
Hibernate HQL Join with composite Key
Hibernate HQL Join with composite Key
I hope this helps you . i'm having some problems trying to write a HQL query to join two entities/tables as below defined , okit was in fact far simplier
TAG : java
Date : November 22 2020, 10:40 AM , By : user2955461
Taking information from a file and organizing it into constants
Taking information from a file and organizing it into constants
Hope this helps You should compare strings not by using == but by using the equals method e.g.str[0] == "username"
TAG : java
Date : November 22 2020, 10:40 AM , By : user2955435
3d point on circumference of a circle with a center, radius and normal vector
3d point on circumference of a circle with a center, radius and normal vector
I hope this helps you . What you need is a new coordinate system to place the circle. As any common coordinate system, we'll want the base vectors to be orthogonal to each other, and have length 1 each. I'll name the base vectors v1, v2, and v3, whic
TAG : java
Date : November 22 2020, 10:40 AM , By : tuschenski
Array is empty once filled? (Java)
Array is empty once filled? (Java)
this one helps. Instead of debugging your code, I propose you a working snippet that does what you need :
TAG : java
Date : November 22 2020, 10:40 AM , By : user2955416
Always on top ImageView
Always on top ImageView
it helps some times I've now used this Chathead method.
TAG : java
Date : November 22 2020, 10:40 AM , By : hpeide
How to declare a new activity in Android manifest?
How to declare a new activity in Android manifest?
I wish did fix the issue. The cause of the null pointer exception turned out to be because I left out the below line of code from the onCreate();setContentView(R.layout.activity_search_result);
TAG : java
Date : November 22 2020, 10:40 AM , By : user2955398
Maven Dependency execution directory
Maven Dependency execution directory
seems to work fine This turned out to be within the Maven repo, not the Jenkins workspace.
TAG : java
Date : November 22 2020, 10:40 AM , By : user2955397
Using digital signature to secure QR code
Using digital signature to secure QR code
With these it helps When I asked this question, I assumed there is some kind of good habit or something similar. Since there is not one provided, I decided to use my own solution, a little similar to DarkSquirrel42's suggestion.I created my own encod
TAG : java
Date : November 22 2020, 10:40 AM , By : sfjoe
Collections.max function is returning hashcodes (I think)
Collections.max function is returning hashcodes (I think)
help you fix your problem System.out.println(maxTree);calls toString() on maxTree. Since you did not override it, it calls the method on Object, which just outputs the full class name and some additional information.You need to implement toString()yo
TAG : java
Date : November 22 2020, 10:38 AM , By : faisalalicpy
How many active users maximum does a Parse.com database allow on the free plan?
How many active users maximum does a Parse.com database allow on the free plan?
hope this fix your issue My reading of the pricing and FAQ pages is that you are not accounted based on the number of users you have. Rather you are accounted based on your aggregate requests per second, file storage, database storage and data transf
TAG : java
Date : November 22 2020, 10:38 AM , By : user2955347
4 digits numbers in an array as String
4 digits numbers in an array as String
I think the issue was by ths following , I need a String array with the following attributes: , The following code will generate an array with your specifications.
TAG : java
Date : November 22 2020, 10:38 AM , By : Kasaragadda Srinu

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