Recent questions tagged java

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java - Graceful exception handling in Swing Worker

I am using threading in application through Swing Worker class. It works fine, yet I have a bad feeling about ... is cleaner in the 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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java - Saving and retrieving date in Firebase

I have a model with the following structure public class OfferModel { private String mImageUrl; private String ... dates in Firebase Android? 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 - Angular 4.3 HTTPClient Basic Authorization not working

I am trying to implement basic authorization in Angular 4 using the newly released HttpClient. I am trying to ... chrome: How to proceed ? 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 - Using apache avro reflect

Avro serialization is popular with Hadoop users but examples are so hard to find. Can anyone help me with this sample ... = read(file); } } 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 - Generics and Class.forName

I would like to create an instance of a specified class using its name. My code is shown below. I get a ... e.printStackTrace(); } } 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 - Parcelable protocol requires a Parcelable.Creator object called CREATOR (I do have CREATOR)

I am trying to pass Parcelable data from one intent to another and this is the error I am getting ... ("parceledData", playersParceledData); 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 - explicit serialVersionUID considered harmful?

I am probably risking some downvotes on this. It seems to me that explicitly specifying serialVersionUID for new ... explicit value. Comments? 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 open activity (incoming voip call) in Android 10

In Android 10 there apply new restrictions for apps. We can no longer start an activity from background. While ... in advance for any hints. 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 let JAXB render boolean as 0 and 1, not true and false

Got a quick question. Does anyone know how to let JAXB (marshall) render boolean fields as 1 and 0 instead of printing out "true" and "false"? 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 - SHA256withRSA what does it do and in what order?

I'm a total newbie when it comes to cryptography and such things. I don't (and dont want to) know the ... for example: "/somewhere/mykey.p12". 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 is zookeeper port and its usage?

I am quite new for zookeeper port through which I am coming across from past few days. I introduced with ... help would be appreciated, 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 - Attempt to invoke virtual method 'android.content.Context.getResources()' on a null object reference

I try to use a fragment to open a database, however, when I click the button to begin searching, the program ... ,it failed.How should I do? 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 implement a Spring Data repository for a @MappedSuperclass

I've got a JPA @MappedSuperClass and an @Entity extending it: @MappedSuperclass public class BaseClass { @Id ... how to solve 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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138 views

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java - Mixing log4j 1.x and log4j 2

I have a new application that is being written using log4j2, to take advantage of some of its new features. One ... of as a last-resort option 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 - Could not autowire field in spring. why?

I keep getting this error, and can't figure out why.. yes I know there many people had similar issues, but reading the ... " /> </bean> </beans> See Question&Answers more detail:os...

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

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482 views

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java - How to run an aggregate function like SUM on two columns in JPA and display their results?

I am new to JPA. So my question should be so simple to some. Below is the Simple Query in SQL which ... FROM TimeEnt WHERE MatterID = 200 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 - JDK 7 class file backward compatibility with JDK 6

Which features of JDK 7 (excluding invokedynamic because it is not used by java) causing a new class file version ... coin features in jdk 7. See Question&Answers more detail:os...

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

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532 views

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java - Spring JpaRepositroy.save() does not appear to throw exception on duplicate saves

I'm currently playing around on Spring boot 1.4.2 in which I've pulled in Spring-boot-starter-web and Spring- ... for long post, ty in advance See Question&Answers more detail:os...

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

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172 views

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java - How to get local server host and port in Spring Boot?

I'm starting up a Spring Boot application with mvn spring-boot:run. One of my @Controllers needs information ... application is binding on? 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 - Final fields initialization order

Here is some code that calls static method A.f() on class that is not initialized yet. Can someone explain behavior of ... } Output: 1 null 1 2 See Question&Answers more detail:os...

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

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246 views

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java - What happened to JAXB's NamespacePrefixMapper in JDK6u18

I've been using com.sun.xml.bind.marshaller.NamespacePrefixMapper in my project, and i had no problem with it ... Any help would be 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 - JavaFX: Undecorated Window

I am attempting to make a Windows PC Toast notification. Right now I am using a mixture of Swing ... Stage(StageStyle.UNDECORATED)) directly? See Question&Answers more detail:os...

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

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257 views

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java - Regular Expressions on Punctuation

So I'm completely new to regular expressions, and I'm trying to use Java's java.util.regex to find ... of regular expressions 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 - How to control the JavaFX Tooltip's delay?

I was playing around with JavaFX's Tooltip. I realized that for me personally the delay between hovering over ... missing an obvious solution? See Question&Answers more detail:os...

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

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525 views

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java - How to prevent XXE attack

We had a security audit on our code, and it mentioned that our code is vulnerable to XML EXternal Entity (XXE) ... ? Where am I missing things? See Question&Answers more detail:os...

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

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370 views

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java - Replace callbacks with observables from RxJava

Im using listeners as callbacks to observe asynchronous operations with Android, but I think that could be great replacing ... ; } }); 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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1.1k views

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java - MapStruct ignore automatically unmapped properties

I am using MapStruct with big models (more than 50 fields) shared between different business use cases in my ... mapped, avoiding this message? 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 insert %20 in place of space in android

I have a xml URL file in which there are white spaces i want to replace white spaces with %20.. how ... InputSource(sourceUrl.openStream())); See Question&Answers more detail:os...

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

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