Recent questions tagged JAVA

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java - What is the difference between setting statement fetch size in JDBC or firing a SQL query with LIMIT clause?

What is the difference between setting statement fetch size in JDBC or firing a SQL query with LIMIT clause? 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 map PostgreSQL enum with JPA and Hibernate

I am trying to map a postgres custom type,named transmission_result, to a Hibernate/JPA POJO. The postgres ... duplicate, exception, retry} 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 - getConstructor with no parameters

I can't seem to use getConstructor for constructors with no parameters. I keep getting the following ... "konstruktor" without problems. 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 - cannot load JSTL taglib within embedded Jetty server

I am writing a web application that runs within an embedded Jetty instance. When I attempt to execute a JSTL ... running with full JSTL support? 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 append data to an existing parquet file

I'm using the following code to create ParquetWriter and to write records to it. ParquetWriter<GenericRecord> ... feasible in my case. See Question&Answers more detail:os...

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

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178 views

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java - log4j 2 - configuration issue

I am trying to configure log4j 2.0 to report logs. My config is saved as log4j2.xml and this is its ... logger is the default logger(console). 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 are method parameters reassigned to local variables?

While looking through the Java API source code I often see method parameters reassigned to local variables. Why is this ... new Values())); } 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 there a way to use UTF-8 with app engine?

I'm looking for some explanation on how the app engine deals with character encodings. I'm working on a ... change anything. Thanks 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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java - Running JUnit Tests in Parallel in IntelliJ IDEA

I have a large suite of tests that takes about half an hour to run and would love to be able to the test ... to do that with IntelliJ IDEA 9? 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 appcompat v7 error

Being new to Android developent I followed the simplest of tutorials, built a new android project, accepting all default ... 6 years ago...) 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 load all beans lazily with @ComponentScan in Spring?

I am using Java-based config to set up my Spring application context like this: @Configuration @Lazy @ComponentScan( ... haven't tested that). See Question&Answers more detail:os...

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

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321 views

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java - Spring and Abstract class - injecting properties in abstract classes

I have an abstract base class with a property called "mailserver" which I wish to inject from the spring ioc ... been successful? Please share. See Question&Answers more detail:os...

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

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668 views

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java - PrintWriter failing to print to file

The file is being created successfully, but I cannot get PrintWriter to print anything to the text file. Code: import java ... exists."); } } } See Question&Answers more detail:os...

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

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140 views

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java - Calling constructor of a generic type

If I have an abstract class like this: public abstract class Item { private Integer value; public Item() { value= ... , and how to avoid 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 close a GUI when I push a JButton?

Does anyone know how to make a jbutton close a gui? I think it is like System.CLOSE(0); but that didnt work. ... );. thanks for the help though! See Question&Answers more detail:os...

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

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108 views

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java - Android Format date with time zone

I need to format the date into a specific string. I used SimpleDateFormat class to format the date using the ... format which I have mentioned. See Question&Answers more detail:os...

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

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244 views

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java - SSL handshake exception: "Algorithm constraints check failed: MD5withRSA"

I tried to install Oracle Entitlements Server Client. When I call config.cmd -smConfigId Sample-SM -prpFileName C: ... me to find a reason? See Question&Answers more detail:os...

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

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196 views

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java - How can split a string which contains only delimiter?

I am using the following code: String sample = "::"; String[] splitTime = sample.split(":"); // extra ... strips empty strings at 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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127 views

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java - retrieve Bean programmatically

@Configuration public class MyConfig { @Bean(name = "myObj") public MyObj getMyObj() { return new MyObj(); } } I have ... foo = new Foo(); } } 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 - Create a radial gradient programmatically

Im trying to reproduce the following gradient programmatically. <shape xmlns:android="http://schemas.android.com/apk/ ... android:centerY="45%" See Question&Answers more detail:os...

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

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426 views

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java - Delete selected item from JList

Can anyone tell me a short way to delete the selected items from my JList? I searched on google and here, but ... ways. Which way should I use? See Question&Answers more detail:os...

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

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746 views

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java - Required MultipartFile parameter 'file' is not present in spring mvc

I am trying to add feature of uploading picture to my spring mvc application. jsp part: ... <form method="POST ... not present What do I wrong? See Question&Answers more detail:os...

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

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130 views

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java update properties file run time

i am writing standalone java app for production monitoring. once it starts running the api is configured for ... this ? Thanks 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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365 views

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java - Deserializing a Map<String, Object> field with Gson

I have a User object with this structure: class User { private String id; private String name; private Map<String ... in advance for your help! See Question&Answers more detail:os...

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

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189 views

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java - Which HTML tags are supported in Swing components?

Many Swing components support embedded HTML, but I cannot find any official documentation on that subject. ( ... any "unofficial" documentation. See Question&Answers more detail:os...

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

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108 views

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java - Get the Integer from the end of a string (variable length)

I have a string of a variable length and at the end of the string are some digits. What would be the best / ... abc12345 --> 12345 ab4cd1 --> 1 See Question&Answers more detail:os...

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

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391 views

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java - Convert RGB value to HSV

I've found a method on the Internet to convert RGB values to HSV values. Unfortunately, when the values are R=G=B, I' ... new double[]{h,s,v}; } See Question&Answers more detail:os...

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

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712 views

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java - Spring test with @DataJpaTest can't autowire class with @Repository (but with interface repository works!)

I'm trying to understand why I can't autowire a class repository but I can autowire a interface repository ... support for class repositories. See Question&Answers more detail:os...

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

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