Java
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Jackson object mapper converts Java maps into JSON maintenance keys
I use Jackson map. The objectmapper API converts a map into a JSON string I use the writevalueasstring method to achie…… -
Java – how to avoid from URL Getfile() get URL encoding path?
I encountered the following problems while trying to get the path to the given resource: System.out.println("nf="+new …… -
Java – nullable types in the kotlin annotation processor
I'm developing an annotation processor for kotlin. Because the processed elements are written in Java, I didn't receiv…… -
Java – the call to super () must be the first statement in the constructor body
I'm writing a constructor for the loginrequest class, which extends a class called jsobobjectrequest (from the volley …… -
Java – how do you configure spring to perform overlapping fixedrate tasks?
I'm trying to execute tasks at a fixed rate using the @ scheduled annotation in Java spring However, by default, if th…… -
Java – how do I handle injecting dependencies into the rich domain model?
How do you handle injecting dependencies into model objects in a web server project with a rich domain model (applicat…… -
Java – cannot reserve heap space
I am using soap UI 5.0 0 open source I'm running soapUI testcases through ant to get JUnit reports build. XML file: &l…… -
Java – what is the fundamental difference between evacuation and compression in garbage collection?
I've read a lot of documentation about hotspot GC for Java se 6 and 7 When it comes to the strategy of obtaining the c…… -
. Net – multithreading and Boolean
I have a class that contains Boolean fields like this: public class MyClass { private bool boolVal; public boo…… -
Java generics pass parameters
I hope someone can help me get rid of this trouble I did this: public static <T> void myMethod(Map<Class<T…… -
Unable to authenticate SSL site in Java: “pathlenconstraint violated – this certificate must be the last certificate in the certificate path”
I tried to read from a secure (i.e. SSL) web page in Java code Please note that I have successfully established a non …… -
Java – line breakpoints do not work in some classes
I am using IntelliJ idea to debug applications running on Tomcat But I have a problem. In some classes, line breakpoin…… -
In Java Purpose of class file
I tried to understand How class files work in Java and what their purpose is I found some information on the Internet,…… -
Java – system. In Tomcat Scope of setproperty
This question is the "cousin" of this one involved Android But here we are in the Tomcat environment If in my webapp, …… -
Java – Eclipse: editing and running code in real time
When editing java code in eclipse, I can modify the code in various ways and make these changes take effect without re…… -
Java – create a user in the keycloak through the keycloak management client and return the illegalargumentexception
I want to create a user through the keycloak management client, but I get: This is my keycloak bean: @Bean Keycloak ke…… -
Java – hibernate onetomany standard returns duplicates
I have an association mapped by: @Entity public class Parent { ... @Id @Column(name = "parent_id") private…… -
How to obtain the actual type parameters of the general interface indirectly implemented?
I have a parameterized interface that can be implemented in many different ways At runtime, I need to find out what th…… -
Java – serialize a class variable that does not implement serialization
I have a class that implements serializable Class has another class object that does not implement serializability Wha…… -
Multithreading – implementation of mixed threading model (M: n)
Three threads model is usually used in the implementation of thread scheduling completed by OS kernel One of them is t…… -
Java – Maven dependency of IBM WebSphere package
I'm trying to use IBM WebSphere 8.0 0.5 "classic" Java EE project is transformed into Maven multi module project, and …… -
Java – how to separate swing GUI from business logic without using spring, etc
Please note that this is a long post Sorry, but I want to clarify one thing: I want to know how to separate swing GUI …… -
Java – how to specify multiple options using Apache commons cli?
What I want: java programName -jobs1 -C 10 -W 20 java programName -job2 java programName -job3 Content: Option o1 =…… -
Java: what is the difference between lsparser and documentbuilder
I'm at org w3c. dom. ls. No information was found on lsparser I know this is an interface, but there is only one way t…… -
Java: retrieve key after executebatch() in H2
I tried to retrieve the generated key from the executebatch() transaction, but I only got the last key to add This is …… -
Java – how do I get exclusive access to certain session entries?
Due to the remote invocation feature of rest services, they are in a state of constantly becoming competitive conditio…… -
Is java 9 abandoning the SHA1 certificate or something else?
[update] Oracle has just revised its encryption roadmap（ https://www.java.com/en/jre-jdk-cryptoroadmap.html ）, they …… -
How to check whether the class file version 50.0 (Java 6) has been pre verified?
I used Proguard to "upgrade" some jar files from class file version 49.0 to 50.0 Because pre validation is optional fo…… -
Java – polymorphism using Jackson to add subtype information at run time
I'm using Jackson to ungroup polymorphic types from JSON I use @ jsontypeinfo, @ jsonsubtypes and @ jsontypename annot…… -
java – arrayListName. What does sort (null) do?
I have a project. The professor gave us some code There is a line in the code that puzzles me: arrayListName.sort(null…… -
Java – how to configure multipartresolver with different maxuploadsize for ordinary users and administrators?
I can use a 10k (10000 byte) maxuploadsize to define such a multipartresolver: <bean id="multipartResolver" cla…… -
Java – abstract classes used in static blocks
I can add the abstract keyword in the static initialization block, but I cannot add abstract methods abstract void dra……