Recent questions tagged java

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java - Redirecting System.out to a TextArea in JavaFX

Update: Still having the same issue, revised source of main app code: http://pastebin.com/fLCwuMVq There must ... data showing on the screen. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Jackson - custom serializer that overrides only specific fields

I know how to use a custom serializer in Jackson (by extending JsonSerializer), but I want the default serializer ... field to a custom output. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How to solve "This element has no attached source and the Javadoc could not be found in the attached Javadoc"?

I don't get the exact method to do this. I want a method not for a single project for all projects in ... tell me how to solve this problem. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - What is the difference between xmx and MaxRAM JVM parameters?

MaxRAM: based on the amount of memory on the machine. The proportion of memory to use for the heap is ... both which one ovverides another? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Display a webpage inside a swing application

I would like to display a webpage inside a java swing application. Similar to a when using HTML, but in java Swing ... possible and if so, how? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Insert using PreparedStatement. How do I auto-increment the ID?

I have a PreparedStatement such as: PreparedStatement preparedStatement = connect.prepareStatement("INSERT into employee ( ... to Statement. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Is there a simple way to compare BufferedImage instances?

I am working on part of a Java application that takes an image as a byte array, reads it into a java.awt ... small part of a large application. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Gradle - FatJar - Could not find or load main class

I know that question was asked a lot and has many answers, but i still get it and I don't understand why. ... hope somone will have the answer ! See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How to extract absolute URL from relative HTML links using Jsoup?

I am using Jsoup to extract URL of an webpage. The href attribute of those URL's are relative like: <a href= ... How can I get the absolute URL? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Programmatically retrieve permissions from manifest.xml in android

I have to programmatically retrieve permissions from the manifest.xml of an android application and I don't know ... the manifest. Thank you. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - ThreadPoolExecutor with unbounded queue not creating new threads

My ThreadPoolExecutor is failing to create new threads. In fact I wrote a somewhat hacky LinkedBlockingQueue that ... not creating new threads? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Incorrect variable names in overridden methods

When I let Android Studio generate override method it will generate the method with strange parameter names. For ... . Any ideas? Thanks See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - javax.persistence.PersistenceException: No Persistence provider for EntityManager named customerManager

I am new to JPA & Hibernate. After reading some online materials I now understand what Hibernate is and how it can ... it be a problem causer!!! See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - JPA using alternative "persistence.xml"

I know that with the instruction: Persistence.createEntityManagerFactory("persistence-unit-name"); The JPA persistence ... -test.xml". See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Convert OffsetDateTime to UTC Timestamp

I have an java.time.OffsetDateTime which I would like to convert to a java.sql.Timestamp. Since Timestamp doesn't ... "Z")).toLocalDateTime()); See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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355 views

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java - Permissions on log files created by log4j RollingFileAppender

How are the permissions for files created by RollingFileAppender determined? I recently changed a daemon process I have to ... </appender> .... See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Swing components and serialization

Why does Swing JComponent class implement the interface Serializable? The way I've implemented my views, they are ... ways to remove them? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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334 views

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java - setImageResource from a string

I would like to change the imageview src based on my string, I have something like this: ImageView ... change the image programmatically? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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266 views

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java - How to get the current Time and TimeZone from Locale?

I have this weird problem, when I create a calendar with a locale, the TimeZone just reverts to the local one ... time from a specific locale ? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Hibernate 3.4 with slf4j and log4j

I'm attempting to upgrade from Hibernate 3.2 to 3.4, which apparently uses slf4j. Our project currently uses ... version of slf4j-api.jar. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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556 views

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java - IntelliJ Compilation Error zip END header not found

The Issue I am unable to compile Java code for an imported Eclipse project on IntelliJ build 182.4505.22 on ... anyone might have a solution. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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301 views

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java - How does kafka consumer auto commit work?

I am reading this one: Automatic Commit The easiest way to commit offsets is to allow the consumer to do it ... committed and when which one? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - mockito test gives no such method error when run as junit test but when jars are added manually in run confugurations, it runs well

I've been facing a peculiar problem. Basically, when I run my Mockito/PowerMockito test normally i.e. 'Run as ... then 'run as junit test'? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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120 views

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java - calling a super method from a static method

Is it possible to call a super static method from child static method? I mean, in a generic way, so far now I ... which doesn't seem to work... See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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220 views

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java - Sort API methods in Swagger-UI

I cannot find any working example, how to achieve the following: I want my API methods in the Swagger-UI sorted ... a new one. Any hints? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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611 views

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java - Using Hibernate query : colon gets treated as parameter / escaping colon

return sessionFactory.getCurrentSession(). createQuery("FROM Weather WHERE city_id = :id AND date " + "BETWEEN ... , hibernate ruins everything. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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324 views

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java - Uncompress BZIP2 archive

I can uncompress zip, gzip, and rar files, but I also need to uncompress bzip2 files as well as unarchive ... What libraries do you recommend? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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445 views

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java - Hibernate mapping a composite key with null values

With Hibernate, can you create a composite ID where one of the columns you are mapping to the ID can have null ... any way to avoid doing this. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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