Recent questions tagged JAVA

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java - Where to put a text file in Grails, and how to get the path

I need to read in a .txt file into a groovy class in order to interrogate it line by line. But I am not ... avail. Any body have any pointers? 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 - Need simple explanation how "lock striping" works with ConcurrentHashMap

According to Java Concurrency in Practice, chapter 11.4.3 says: Lock splitting can sometimes be extended to partition ... :) 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 - Correct way to deploy WAR files in docker image

What is the docker way to deploy java projects in a docker container? Do I copy the war into webapps: FROM ... war instead of the war file? 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 - Changing the generated name of a foreign key in Hibernate

@OneToOne() @JoinColumn(name="vehicle_id", referencedColumnName="vehicleId") public Vehicle getVehicle() { return ... for example. 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 - Threads per Processor

In Java, is there a programmatic way to find out how many concurrent threads are supported by a CPU? Update To ... for every single one of them. 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 forget a wireless network in android programmatically?

I am working on an app which wifi , where user will be asked to enter password for the scanned network ... wifimanager? Or any other solution? 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 - Log4j output not displayed in Eclipse console

For some reason my Eclipse console no longer displays Log4j INFO and DEBUG statements when I run JUnit tests. In ... , Build id: 20100617-1415 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 - Lightweight JMS broker

I'm looking for a small and yet efficient enough lightweight JMS broker solution with no or minimum of ... custom bunch of classes. 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 - Loading a Class from a String

I want to instantiate a class by the value of a String. I found several tutorials that show several methods for ... me there is a better way. 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 - Which version of XPATH and XSLT am I using..?

How to know which version of XPATH and XSLT am I using...? Say I have installed JDK 1.7 then which version of XPATH and XSLT do I have..? 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 - Fastest algorithm to check if a number is pandigital?

Pandigital number is a number that contains the digits 1..number length. For example 123, 4312 and 967412385. I ... the same time as @andras. 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 - Hibernate (JPA) inheritance mapping of abstract super classes

My data model represents legal entities, such as a Business or a Person. Both are tax-paying entities, and ... be taking for this situation? See Question&Answers more detail:os...

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

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311 views

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java - Can @PathVariable return null if it's not found?

Is it possible to make the @PathVariable to return null if the path variable is not in the url? ... @PathVariable [example] in @RequestMapping 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 does ScheduledThreadPoolExecutor only accept a fixed number of threads?

I may imagine some tasks scheduled to take a very long time and ScheduledThreadPoolExecutor would create additional threads ... is that so ? See Question&Answers more detail:os...

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

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238 views

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java - how to set length of an column in hibernate with maximum length

I want to save an object in data base. I'm using MySQL data base, but when I try it I get an ... the length of my column using hibernate? See Question&Answers more detail:os...

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

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258 views

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java - JUnit: testing helper class with only static methods

I am testing a helper class with only static methods with JUnit4 and Cobertura. Testing methods was easy task ... class is quite helpful. See Question&Answers more detail:os...

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

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177 views

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java - Safely clearing Hibernate session in the middle of large transaction

I am using Spring+Hibernate for an operation which requires creating and updating literally hundreds of thousands of ... you for the answers. See Question&Answers more detail:os...

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

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118 views

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java - android - what is message queue native poll once in android?

I know that threads have a message queue and handlers are able to push runnables or messages to them, but ... find the profiler result below. See Question&Answers more detail:os...

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

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366 views

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java - JPA: When to choose Multivalued Association vs. Element Collection Mapping

I would like to better understand the differences between (1) a traditional Multivalued Relationship/Association @Entity -> ... ? Thank you, J. See Question&Answers more detail:os...

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

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364 views

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java - JAXB generating JAXBElement<String> instead of String

I am using Apache CXF cxf-codegen-plugin Maven plugin to generate sources from WSDL file. ... JAXBElement<String> requestStatusDescription; See Question&Answers more detail:os...

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

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395 views

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java - difference between redirect and redirect inside modelandview

In spring controller class to redirect to a url some places all using return "redirect:/abc.htm"; ... there any difference in RedirectAttributes See Question&Answers more detail:os...

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

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274 views

1 answer

java - Storing and Retrieving ArrayList values from hashmap

I have a hashmap of the following type HashMap<String,ArrayList<Integer>> map=new HashMap<String,ArrayList<Integer>> ... map.put(string,number); See Question&Answers more detail:os...

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

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328 views

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java - Successful build in Maven still showing errors in Eclipse

I'm having something quite peculiar here, my build is successful in maven when I type "mvn clean install" however ... can see quartz is here: See Question&Answers more detail:os...

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

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415 views

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java - Using Apache HttpClient how to set the TIMEOUT on a request and response

I need to set time out for the Http Request we make to a service (not a web service). We are using ... .fromJson(r); return jsonObj; } See Question&Answers more detail:os...

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

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310 views

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java - RxJava 2.x: Should I use Flowable or Single/Completable?

I'm developing an Android app using Clean Architecture and I'm migrating it to RxJava 2.x. I have ... /Flowable/Observable in findUser method. See Question&Answers more detail:os...

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

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335 views

1 answer

java - Reading inputStream using BufferedReader.readLine() is too slow

I am using following code. BufferedReader in = new BufferedReader(new InputStreamReader(conn.getInputStream())); String ... line. Please help See Question&Answers more detail:os...

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

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389 views

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java - How to test HQL queries?

I'm searching for a fast (really fast) way to test changes to hibernate queries. I have a huge application ... and enable a fast query check? See Question&Answers more detail:os...

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

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904 views

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java - "The import org.springframework cannot be resolved."

Here is my POM.xml file: <project> <properties> <jdk.version>1.6</jdk.version> <spring.version>3.2.2 ... cannot pick the dependency from there. See Question&Answers more detail:os...

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

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