Java
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Java – how to start multiple debugging sessions in eclipse by clicking?
I am currently writing GWT applications through eclipse Eclipse is used for development, but I use the m2eclipse plug-…… -
How to ensure that Java programs use UTF-8 encoding
I recently found that relying on the JVM's default encoding can lead to errors I should explicitly use specific encodi…… -
Java – ideas for an alternative to ORM RDBMS?
I am currently developing proof of concept for alternative data storage The reason why I need to enhance a webapp that…… -
Java – IntelliJ displays the “always true” prompt, but not “always false”
Therefore, I use IntelliJ idea to program in Java. I'm trying to use the keyword instanceof. My code looks like this i…… -
Java – output Jersey record to file?
We have added these to our web In XML: <init-param> <param-name>com.sun.jersey.spi.container.Container…… -
Java – spring does not send all the fields in the JSON response
My POJO: import java.io.Serializable; import javax.persistence.Entity; import javax.persistence.Id; import javax.pers…… -
Add a custom jmod to the module path using java 9
I used this jmod tool to create a simple jmod file $JAVA_HOME/bin/jmod create --class-path classes test/samples.jmod N…… -
OAuth – what are the main differences between socialauth, scribe Java and spring social?
I'm new to OAuth, but I want to find a good way to start and use a widely supported library Here are the pros and cons…… -
Java – Show / hide JPopupMenu from JButton; Focuslistener is not working properly?
I need a JButton with an additional drop-down style menu So I took a JPopupMenu and attached it to JButton in the way …… -
Java – how to get hibernate dialect at runtime
In my application, I use hibernate and SQL Server database, so I set <property name="hibernate.dialect" value="org.…… -
Java – strange behavior when downloading HTML using httpurlconnection
In my android Wikipedia reader application, I'm using httpurlconnection to download the HTML of the article. Some user…… -
Java – focus on snippets
I'm looking at an open source project on GitHub. I found the following code line in Java, static byte[] byteArray = ne…… -
How to find errors in the new JavaFX error tracker
The existing JavaFX error link has died How to find errors in the new system? For example How to find bugs Solution As…… -
Eclipse UML plug-in with java code generation
Does anyone know that a good (read: free) eclipse UML plug-in can also do code generation? If not, does anyone know an…… -
If may is complete, convert may to single from another source
I want to build a repository class that returns single < something > This class should first check the cache, wh…… -
RX Java – groupby operator, items from different groups are interleaved
The following codes: Observable .just(0,1,2,3,4,5,6,7,8,9) .doOnNext(item -> System.out.pri…… -
Java – use log4j to create new log files every day
I want to use log4j in my java project. What configuration should I provide log4j.appender.FILE = org.apache.log4j.Dai…… -
Java – why did this method call fail? (generic and wildcard)
I received the following error: 'call(ContainsMonitor)' cannot invoke 'call(? extends webscout.Monitor)' in 'WebScoutC…… -
Java – JNA memory leak
In view of this, C code: void LoadData(char** myVar) { std:: string str("[Really Long String Here]"); unsigned…… -
Java – Protocol buffer: enumeration problem
I have the following Proto file: enum Enum1{ X=0; Y=1; } message SomeClass{ required Enum1 enum1=1; …… -
How to convert a string to a date in Java, regardless of the system format [copy]
See English answers > parse any date in java3 public static String dateToString(String date){ if(date.equals(""…… -
Java – browser authentication via httpurlconnection
At present, I am studying the implementation of tmdb API There is a method called user authentication I have successfu…… -
Java – Apache spark lambda expression – serialization problem
I tried to use a lambda expression in the spark task and threw a "Java. Lang. illegalargumentexception: invalid lambda…… -
JPA – correct join in jpql
I have the following JPA entities: @Entity class UserClient{ @Id @GeneratedValue(strategy = GenerationType.AUT…… -
Java – using PostgreSQL, why doesn’t hibernate / JPA create cascading constraints?
I have an entity: @OneToMany(cascade = CascadeType.ALL,mappedBy = "bar") private Set<Foo> fooSet; An entity foo:…… -
Java – spring batch: different job initiators for different jobs
I have two different jobs (actually more, but assume 2 for simplicity) Each job can run in parallel with another job, …… -
java. security. AccessControlException：access denied(“java.lang.RuntimePermission”“accessClassInPackage.sun.reflect.annotation”)Spring
I use Google application engine and spring security to create a simple spring MVC application When I run my applicatio…… -
Java – Apache POI docx – how to set the page size?
Does anyone know how to change the page size (from letter to A4) for X wpfdocument (docx)? I can't find any printsetup…… -
Java messaging service and Haskell
I wonder if there is any way to receive JMS messages from some providers in the Haskell program, such as ActiveMQ or w…… -
Java – Jackson Deserialize the missing attribute to null optional
Suppose I have such a class: public static class Test { private Optional<String> something; pu…… -
Java – sqlitedatabase ‘does not implement interface’
This error occurs when sqlitedatabase is used as closeable I have a sample project to recreate it: https://github.com/…… -
Java – convert simpledateformat to datetimeformatter
Therefore, when trying to replace some legacy code with simpledateformat and date, use Java time. Datetimeformatter an……