Java
-
Java: namedquery string problem
Hello, I encountered some exact matching problems when doing namedquery I am currently using something like this: @Nam…… -
dispatch_ semaphore_ Grand central dispatch of create – lvalue parameter?
In dispatch_ semaphore_ In create, what does the long value parameter mean? dispatch_semaphore_create(long value) I do…… -
Java – namedentitygraph – JPA / hibernate.org hibernate. loader. Multiplebagfetchexception: cannot get multiple packages at the same time
We have a project where we need to load a collection of entities lazily, but in some cases we need them to load them e…… -
Java – displays JPA SQL statements when using play framework 2
I am developing a web application using play framework and JPA / hibernate For debugging purposes, I'm glad to see the…… -
java. sql. Sqlexception: no suitable driver found
I tried to use the following dbquery The Java class performs a simple query, which uses the dbconnector to obtain a co…… -
“No select item” on JavaFX combo box?
stay Combo@R_705_2419 @What is the correct way to place items with null values in? Exception in thread "JavaFX Applica…… -
How to use JfreeChart to display dates on the X axis of a line chart
I tried to display the line chart with time (HH: mm: SS) as X axis and number (as y axis) for (Row row : sheet) { …… -
Java – why is static final slower than new at each iteration
Why is code snippet 14 times slower than code snippet B? Code snippet A: import java.awt.geom.RoundRectangle2D; publi…… -
Java: text strings
class A { class A { String s4 = "abc"; static public void main(String[]args ) { String s1 = "abc"; …… -
Java implicit conversion
Use the following code: Float a = 1.2; There is an error because it takes decimal as the value of double, which is a l…… -
Java – restlet client repeatedly calls restlet server suspend
I am using restlet to implement web services The client (also using restlet) makes several consecutive calls to the se…… -
Java: text strings
class A { class A { String s4 = "abc"; static public void main(String[]args ) { String s1 = "abc"; …… -
What is the best way to learn security in Java A-Z
I am a J2SE / Jee developer, a novice in Java security, and plan to learn more about this topic You can help me guide …… -
Java – what does the @ modelattribute annotation at the method parameter level mean?
The spring 3 reference tells us: I don't understand this magic spell because I'm sure that the alias of the model obje…… -
Java – SQL prepared statement for creating tables
I want to know some methods of dynamically creating tables based on user input (SQL prepared statement) CREATE TABLE ?…… -
“Cannot reproduce” – is java deterministic multithreading possible?
Can this run multithreaded Java applications in a deterministic manner? I mean, always use the same thread switch in t…… -
How to use java to calculate the number of options in the selection drop-down box in selenium webdriver?
I have a selection drop-down list: xpath //*[@id="ddlTablePay"] I need to calculate the number of options in this drop…… -
Help use Horner’s rules and hash functions in Java?
I'm trying to convert words to integers using Horner's rules I understand how it works. If the word is long, it may ca…… -
Filtering lists using java 8 lambda expressions
I have a project class: class Project { List<Name> names; int year; public List<Name> getNames…… -
Java simple telnet client using socket
I have read a lot about this topic. Telnet is a protocol, not a simple socket connection, waiting for line breaks, usi…… -
How do I skip the first line of CSV in Java?
I want to skip the first line and use the second line as the title I am using the classes in Apache commons CSV to pro…… -
Java – restrict access to spring MVC controller – N sessions at a time
We have licensed commercial products (unimportant products in this case), which is limited by the number of concurrent…… -
Java – programmatically resolve Maven dependencies outside the plug-in – get the repository systemsession and repository system
Maybe this will be a bigger task than I thought at first, but no matter I try to load a maven project from a file and …… -
Java – how to use order in HQL?
I want to execute my HQL query like this: Query queryPayment=sixSession.createQuery("from Payment where vcode=:p_Vcode…… -
I really need to define the minimum heap size for Java
I'm about to deploy the application to the real-time server, and now I'm in the part of setting the heap and permgen s…… -
Java – andengine – cannot instantiate activity
I'm a novice in Android development. I have a problem using andengine I tried to run an empty application, but got a r…… -
An unexpected error occurred while using Lambdas in Java 8
I use Java 8 update 20 32-bit, Maven 3.2 3. Eclipse Luna build ID: 20140612-0600 32 bits After I started using Lambdas…… -
Why is tomee Java ee6 certified but not tomee?
As the title says I know very little about the internal working principle of Java ee6 certification However, it seems …… -
Variable declaration in Java – if clause
if(someCondition) if(someCondition) int a=10;//Compilation Error else if(SomeOtherCondition){ int b=10;//no compilat…… -
Java – wait for the third-party thread to complete
I have a thread running a third-party library, which will also run its own thread When the run method of my thread com…… -
java – JAXBElement vs boolean
What exactly is a jaxbelement Boolean value and how to set it to Boolean equivalent to "true"? method: public void set…… -
What types of encryption are available in Java?
I am implementing the data transfer model in Java I have implemented DES, 3DES and AES in my application. I would like……