Recent questions tagged java

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java - Multiple @ManyToOne fields pointing to same entity in JPA / Hibernate

I have an Order entity that has a billingAddress and a shippingAddress. I also have an Address entity. I am ... private Set<Order> orders; } 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 - Simplified Bresenham's line algorithm: What does it *exactly* do?

Based on Wikipedia's article on Bresenham's line algorithm I've implemented the simplified version described there ... 's line algorithm? 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 do I call a method of a generic type object?

The below code gives me the error: SceneNode.java:17: cannot find symbol symbol : method execute() ... something fundamental about generics. 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 should url-pattern in servlet mapping start with forward slash(/)

I was reading Head First JSP and Servlets book. I was going through the mapping of servlet. And my doubt here ... url-pattern. Can you explain? 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 JVM synchronization practices can I ignore assuming I know I will run on x64 cpus?

I know that the JVM memory model is made for lowest common denominator of CPUs, so it has to assume the weakest ... i would with ints/floats)? 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 delete old logs with log4j2

( F.Y.I. I already searched out many documents in Internet. I'm using storm-0.10.0-beta1. Configuration file ... t catch yet, please notify me. 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: Cannot invoke toString() on the primitive type int

If I try nltxt = nllen.toString(); with nllen being int nllen = nl.getLength(); I get the error Cannot invoke ... ... Why doesn't it work? 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 - Encrypt text to AES/CBC/PKCS7Padding

I am developing a web application to encrypt some texts with java 6. The encrypted that I have to do is a AES ( ... tell me how I have to 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 - Read properties by dynamic keys in spring boot

I wanted to know if there is any way in Spring Boot to read property values from properties file by using ... is provided by Spring Boot? 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 - Get hold of a JDBC Connection object from a Stateless Bean

In a Stateless Session Bean an EntityManager is injected but I would like to get hold of a Connection object in ... there any solution to 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 - Checking if 2 strings contain the same characters?

Is there a way to check if two strings contain the same characters. For example, abc, bca -> true aaa, aaa -> ... -> false abc, def -> 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 - Configure Truststore in Tomcat

I have a Java servlet currently running on Tomcat 7 (Windows) and it connects to a SQL Server database. I now ... file do I put the command? 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 - Spring Data Repository @Query - Update and return modified entity

let's assume we have a Spring Data repository interface with a custom method... @Modifying @Transactional @Query("UPDATE ... for such 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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java - PUT and POST getting 405 Method Not Allowed Error for Restful Web Services

I am trying to set up a simple Restful Web-Service which returns either JSON or XML according to the Accept ... not have anything in PUT. 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 - SSH tunneling via JSch

My aim is to connect to a server (host) which is behind a firewall. I am able to access this server by ... ProxySOCKS5.java:200) ... 3 more 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 do I supply configuration to elastic beanstalk tomcat

when deploying locally to tomcat, I make this change (below) to server.xml, is there a way I can supply this ... redirectPort="8443"/>' 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 - Are there any good CachedRowSet implementations other than the proprietary Sun one?

I am investigating using javax.sql.rowset.CachedRowSet in part of my application, however I can only find ... something that supports MySQL. 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 can I share resources between the different Eclipse projects, so as to avoid duplication?

I have 2 android applications that share 95% of their resources, layouts, strings etc. only a few jpg's ... as to avoid resource duplication ? 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 - IllegalAccessException on using reflection

I was trying to learn reflection and I came across this IllegalAccessException. Please see the following code: public ... ? 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 - How do I log response in Spring RestTemplate?

I am using RestTemplate to make calls to a web service. String userId = restTemplate.getForObject(createUserUrl, String. ... response to a log? 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 - Mocking private method of class under test using JMockit

I want to mock private method of a class under test but method return false first two times when the method is called ... 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 - Warning: no suitable certificate found - continuing without client authentication

Team I am facing following issue when try to complete a mutual handshake using HTTPS main, READ: TLSv1.2 ... Any help will 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 - Is it possible for a JVM to run more than one program at the same time?

Is it possible for a JVM to run more than one program at the same time? If so, how? If not, why? ... same JVM instance to run another program? 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 - Converting JSON between string and byte[] with GSON

I'm using hibernate to map objects to the database. A client (an iOS app) sends me particular objects in ... which GSON generates the object. 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 - Creating Indices name Dynamically in Elasticsearch using Spring-Data Elasticsearch

I have a use case where in need to create the indices per month in Elasticsearch. The idea is to create ... if any more details are required. 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 - List vs List<Object>

Why do we lose type safety when using List and not while using List<Object>? Aren't they basically the same thing? ... Integer(1)); } } Why? 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 cause org.hibernate.PropertyAccessException: Exception occurred inside setter

What cause this exception, I can't manage to find out. Request processing failed; nested exception is javax.persistence.PersistenceException: ... -core-4.2.0.Final.jar:4.2.0.Final]...

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

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java - How to get the pure Json string from DynamoDB stream new image?

I've a Dynamodb table with streaming enabled. Also I've created a trigger for this table which calls an AWS Lambda ... + " records."; } } See Question&Answers more detail:os...

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

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