Recent questions tagged Java

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java - instanceof operator - why there is Illegal compile time error

Considering the following code, I don't understand why "System.out.println( c2 instanceof D);" will result an "illegal ... C c2 = new C();` See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Multiple lambda method references

It's possible to chain/concatenate what is done with elements in a lambda expression like this: list.forEach(s -> ... System.out::println; }); See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - PDF generation using iText in Struts-2 : result type stream not working

My requirement is to generate PDF file using iText, I use below code to create a sample PDF Document ... the resultType as stream Thanks See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Android Retrofit Base64 @Body

Hi all i have this code in android 4.3 and i am using retrofit just now but server thrown me an error ... @Path("WATERMARK") String watermark); See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How to authenticate against Active Directory via LDAP over TLS?

I have a working proof-of-concept application which can successfully authenticate against Active Directory via LDAP on ... help is appreciated. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Change the location of the accessory component in a filechooser

I have a problem in changing the location of the accessory component in a filechooser. I customized a save file ... the exactly effect I want. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Sorting PriorityQueue

I am having a problem with PriorityQueues, as I am lead to believe it orders on priority however I am not ... where the class sorts perfectly. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How to wrap text around an image?

I'm trying to wrap my text around an Image. The structure I need to create is as in the picture bellow: This is what ... </head> <body text="#000000" link="#000000" alink="#000000"...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How to view a PDF document using PDFBox's PDFPagePanel

I cannot seem to figure out how to view a PDF Page using PDFBox and its PDFPagePanel component. So it seems ... a means to displaying a PDF? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Two Classes have same XML type name

Im having this error where it says that i have two classes of same XML type name so the problem is between ... ; Why is there problem here? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Safe way to use table name as parameter in JDBC query

What is the safe way how to put table name as parameter into SQL query? You cannot put table name as parameter ... the best approach to do this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Synchronized method does not work as expected

I have a variable which is shared by two threads. The two threads will do some operations on it. I don ... . Can anyone explain this phenomenon? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Intellij and sbt 0.13.5 "URI has an authority component"

I'm working on a play framework project using Java as well as Amazon Web Services. This is my build.sbt ... in my actual playframework project. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Can we calculate Spring bean initialization time

I would like to develop a spring AOP feature where we can put a point cut/within during the spring bean ... possible using spring AOP module? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - What are the predefined modules in JDK9 or Which module do I need to fix dependency problems?

JDK9 will (probably) introduce a module system. As part of that, the Java Class Library will get modularized. ... to include as a dependency? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How do I set an environment variable in a YARN Spark job?

I'm attempting to access Accumulo 1.6 from an Apache Spark job (written in Java) by using an AccumuloInputFormat with ... , Value.class); } } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Avoiding n+1 eager fetching of child collection element association

I have the following classes: @Entity @Table(name = "base") @Inheritance(strategy = InheritanceType.SINGLE_TABLE) ... to figure it out. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Check if string has all the letters of the alphabet

What would be the best logic to check all the letters in a given string. If all the 26 letters are available in ... my code would be in Java. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How to use Collections methods(removeAll() and retainAll()) for two objects. (objects are parent-child relation)

I expected to result below but actually not. I would like to know how to show the differences between two Collections. ... this.name = name; } } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Android - Appium Swipe down not working

I am trying to swipe down contact screen but its not working. Here is the code I have tried. public void ... help will be highly appreciated. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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386 views

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java - url parameters in jnlp href attribute

I've been using url parameters to pass arguments to the main-method of the .jar application. After updating to ... to get around the problem? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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261 views

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java - "available" of DataInputStream from Socket

I have this code on the client side : DataInputStream dis = new DataInputStream(socketChannel.socket(). ... any other suggestions ? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Unable to replace/navigate fragments

I am trying to navigate from one fragment to another. These two fragments are 100% different, there is no ... it is happening like this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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438 views

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java - Append data to existing gridfs file

As i can see java mongo driver does not provide capability to get OutputStream from existing gridFS file com.mongodb. ... old one ? Thank you See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Go to last row from result set in jdbc with sql server

i try to select from my table, only select the last row. I've tried this : rset = s.executeQuery("select ... will be help another. Java rocks! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Getting null pointer exception while running helloworld in drools

I got the following error while running a simple helloworld sample drools project. 199 [main] ERROR org.drools. ... .println( myMessage ); end See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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412 views

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java - JAVAFX Text Area is not showing formatted output of the string

Here scenario is program reads output properly and it is also printing properly in the log file but when displying ... question is not visible. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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488 views

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java - Different behavior of ClassLoader.getSystemClassLoader().getResource() in servlet container and test environment

I have a web application my requirement is to read some files and process it and persist the file content in ... "MyFile") gives the null. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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