Recent questions tagged Java

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java - Spring Data mongo to insert null values to DB

I am using Spring data mongo to insert a record to Mongo, here is my code mongoTemplate.save(person,"personCollection ... Doe","address":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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java 8 - How to pass argument to class constructor when initialzed thru ::new in Java8

I am using java 8 stream API to perform action on a list of Store objects. Store takes a String argument and ... (Collectors.toList()); } } 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 Bluetooth Connection - Service Discovery Failed

I'm trying to create a basic bluetooth application, for testing the device. I got the code from developer. ... this app on different devices. 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 - Use lambda expressions inside TextField expression in Jaspersoft Studio 6.3

I want to use lambda expressions inside a TextField expression like this: Arrays.asList($F{field1}, $F{ ... jasper compiler supports lambdas? 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 - Why doesn't ImageIO read a BMP file until it is re-saved in MS Paint?

I have a bitmap file, test3.bmp, which I can view and edit with every image viewer I have tested with. That ... { t.printStackTrace(); } } } 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 - Use servlet filter to remove a form parameter from posted data

A vendor has been posting XML data over HTTPS within a form variable named XMLContent to my Coldfusion application server. I ... )); } }; } } 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 - Is Stream.count() guranteed to visit each element?

In other words, is the following line guranteed to print num lines? int num = list.stream().peek(System.out ... in a short-circuiting way. 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 configure and get session in Hibernate 4.3.4.Final?

I recently upgraded the version of my Hibernate to 4.3.4.Final. Based on Contextual Sessions configuration of Hibernate ... (); } return 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 - Getting server address and application name

Environment: NetBeans 6.9.1, GlassFish 3.1 I have a Java Web Application. How to get the server address and the ... it via JMX? Any other ways? 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 - Search a file for a String and return that String if found

How can you search through a txt file for a String that the user inputs and then return that String to the ... file contains a list of names. 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 - JList.getModel() ClassCastException

When I call JList<String>.getModel() and cast it to DefaultListModel<String> it gives me this exception. ... to stop this from happening? 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 freeze column in GXT 3.x?

How can frozen columns be implemented in GXT 3.x (from Sencha)? Ext-JS, another product from Sencha seems ... 0/examples/grid/locking-grid.html 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 - Why is main method used in JavaFX Application when start() already exist

The starting point for a JavaFX application is start method. But in the sample JavaFX applications, there is a main ... { launch(args); } } 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 - Maven parallel test output

When I set my Maven build to run my integration tests in parallel, I see: 01:31:47 --------- ... understand the progress of the build otherwise. 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 - Client side sessions

I want the clients of several related web apps to hold their own authentication state. This improves ... client side session management? See Question&Answers more detail:os...

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

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562 views

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java - non-static variable this cannot be referenced from a static context

The error comes from this line BoardState addme = new BoardState(); For some reason the non-static variable that it is ... add(addme); } }.... 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 Spring Security to custom login page?

I am using Spring Security to my application and here is the security part which authenticates the user but the ... Security's login page? 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 language support for JavaFX in FXML documents?

How can I have different languages for a view in a FXML document to support many countries? 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 - Reduce external jar file size

I've developed a module for a Java project. The module depends on external library (fastutil). The problem ... download all this extra weight? 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 - split very large text file by max rows

I want to split a huge file containing strings into a set of new (smaller) file and tried to use nio2. I do not ... ++; } writer.close(); } } 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 - In Spring Boot, adding a custom converter by extending MappingJackson2HttpMessageConverter seems to overwrite the existing converter

I'm trying to create a converter for a custom media-type like application/vnd.custom. ... deserialized by MappingJackson2HttpMessageConverter? 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 handle with CLASSPATH in Maven project?

I am trying simple Maven app with Log4J ver 2-beta 9. In my pom.xml file I have these two dependencies ... be CLASSPATH set for Maven 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 - Where should I put external JAR files when developing a web app?

I'm developing a dynamic web application with Java (Servlets/JSP) in Eclipse. I'm trying to use an ... I would appreciate detailed solutions. 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 - Hibernate Envers fails with @Converter and AttributeConverter (JPA 2.1)

I am using Hibernate 4.3.4 with Envers, and MySql 5.6. Without a JPA 2.1 converter, the ... Is Envers even compatible with AttributeConverters? 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 integer middle value formula

I am looking for an efficient formula working in Java which calculates the following expression: (low + high) ... to be signed shift. 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 get Column names of JPA entity

All my JPA entity classes implement an interface called Entity which is defined like this: public interface Entity ... I need. Any ideas? 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 sort search results on multiple fields using a weighting function?

I have a Lucene index where every document has several fields which contain numeric values. Now I would like to ... this goal in another way? 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 - Jackson deserialize GeoJson Point in Spring Boot

I have a @Entity model that has a property of type com.vividsolutions.jts.geom.Point. When I try to render this model ... I'd like to keep it. See Question&Answers more detail:os...

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

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