Java
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Java – JDBC transaction and connection clarification
I'm using JDBC to talk to my Postgres database If my entire application runs a single connection, that is, there is on…… -
@ preauthorize at the type level of Java – spring security cannot be overridden at the method level
I try to protect the controller with a type level @ preauthorize annotation and try to override this behavior by using…… -
Java print string variable
When I run (seemingly simple) code, I get some strange output This is what I have: import java.util.Scanner; public c…… -
Java – Tomcat spring and environment variables
In the spring file, I have: <bean id="propertyConfigurer" class="org.myapp.MyConfigurator"> <property…… -
Java – how to make the variable method take a single array as the first value of the varargs array?
Given the variable: Object[] ab = new Object[] { "a","b" }; Object[] cd = new Object[] { "c","d" }; When the following…… -
Java – resulset – cursor: rs.next() takes a lot of time
The cursor I returned from the database executes in 31 MS (milliseconds) But when I use this cursor to get more than 1…… -
Java – the jdbc driver throws a “resultset closed” exception on an empty resultset
I have a problem with the jdbc driver for SQLite I am using the select statement to execute the query If I get an empt…… -
Java – compare log4j and logger
Compare the logger of JDK with Apache log4j? Which is more suitable for a new project for Java 6? How do they compare …… -
Java 8u31 plug-ins cause signed applets to load much more slowly
I've noticed that signed applets load much slower with the latest plug-ins (included in Java 8u31 and 7u75) I have deb…… -
Virtual machine – import VHD to Parallels Desktop 6 on MAC
I see everywhere, but I can't find the answer, so: I have a VHD image created for me by a customer - he installed win7…… -
Java – on IntelliJ 13, the created executable jar is invalid or corrupt
I try to create an executable jar from a project on IntelliJ 13 (win8). According to these answers, how to build jars …… -
Java – the relationship between bytecode instructions and processor operations
The Java specification guarantees that the original variable assignment is always atomic (long and double type expecte…… -
Java – the difference between resteasy and jax-rs
What is resteasy? What is the difference between resteasy and jax-rs? Solution According to its home resteasy is So ja…… -
Java – JSTL string comparison always returns false
I'm trying string comparison <c:if test="${dept eq 'account'}"></c:if> But this always returns false I che…… -
Can the Java – hibernate tool generate JPA POJOs?
Can I know if the Eclipse Plug-in hibernate tool can be used to generate JPA entity @ entity? The generated java files…… -
Migration of JAXB for Java – Weblogic 12C disaggregation
We have a Weblogic 10.3 5.0, we are migrating to WL 12.1 2.0. 0. We are solving the problem of ungrouping WS calls fro…… -
Limit the length of content obtained by Java httpurlconnection
Yes, so I started to create a java download manager project that worked well The only problem I see so far is when I a…… -
Java – does hibernate 4 and ehcache need ehcache core library?
I tried to upgrade my hibernate 3 application to hibernate 4 The application uses ehcache When upgrading to hibernate …… -
Java – add parameters to the job context from the tasklet step and use them in subsequent steps of spring batch
Now, I use jobparameters to get the file names of my flatfileitemreader and flatfileitemwriter My batch can be tested,…… -
Java – servlet filter “proxy”, which only acts on the response of the remote endpoint
I need that some HTTP requests must be redirected to the spring boot web application / service, but on the requester s…… -
Java – what are the benefits of using “import static”?
What are the benefits of using "import static"? Solution In general, you should use the static import very sparingly O…… -
Java – replace El in JSP with spel from spring 3.0
Tired of old el, unable to call bean and other methods in JSP Can I use spiel from spring 3.0 in JSP? Solution Upcomin…… -
Multithreading – synchronous counter in clojure
If I want to keep a global counter (for example, count the number of incoming requests across multiple threads), the b…… -
Java – replace cutycapt
Is there any alternative to cutycapt... That can be accessed using the Java library In short, cutycapt is a cross plat…… -
How to set timeout on BufferedReader and printwriter in Java 1.4?
How do I set timeouts in BufferedReader and printwriter created using socket connections? This is my code for the serv…… -
Error when using logmanager (l4j2) and Java 8 (java.lang.reflect.annotatedelement cannot be resolved)
When I switched the JDK version of a new project from 7u45 to 8u20, I encountered a strange error At the beginning of …… -
Processing lists using rxjava and retrofit
I have several API calls (sequential, asynchronous), some of which return lists My API interface is as follows @GET("/…… -
Java – get the most common image colors
I want to get the most common colors from the image I use Java and I want to have the main color Is there any CBIR Jav…… -
The package imported by Java does not exist
I'm trying to use pdf@R_688_2419 @To write a simple PDF file, but the problem is that I received an error: cannot find…… -
Java – let actionlistener listen for changes in jtextfield instead of just entering?
So you may know that if you have a text field and add an actionlistener, it will only listen to the buttons However, I…… -
JPA best practices and Java 8 optional return?
I like the semantics of Java 8. I use a lot of such code in my Dao: public Optional<User> findBy(String username…… -
Accessing Gmail from Java
I need a library that allows me to use Java for email operations in Gmail (e.g. send / receive mail) Solution Have you……