MAVEN uses notes to load json-lib issues

A description of the problem (IDEA):

1, CONFIGURED in Pom.xml

<Dependency>          <groupId>Net.sf.json-lib</groupId>          <Artifactid>Json-lib</Artifactid>          <version>2.4</version></Dependency>

2, the project code inside is not import Json-lib class

Second, reason analysis
   1, the jar must not be downloaded successfully;
   2, suspicion of a central warehouse problem.

Third, solve the problem:
   1, change the central warehouse to:  http://repo1.maven.org/maven2/
   2, right-click on Pom.xml, select Maven>>reimport, re-download jar (preferably delete JSON-related directories in the local jar directory)
   3, found 2.4 of the directory, there is no jar
   4, then opened http://repo1.maven.org/maven2/net/sf/json-lib/json-lib/2.4/, found that there is no json-lib-2.4.jar, only

Json-lib-2.4-jdk15.jar      
   5, then modify dependency, add classifier node:

        <Dependency>            <groupId>Net.sf.json-lib</groupId>            <Artifactid>Json-lib</Artifactid>            <version>2.4</version>            <classifier>Jdk15</classifier>        </Dependency>

6, continue reimport, successfully download Json-lib-2.4-jdk15.jar.

Iv. Other

1, restore the central warehouse to https://maven.alfresco.com/nexus/content/groups/public/, also can reimport to jar package;

2, so from the above, is mainly dependency configuration problems, if the next occurrence of similar problems, directly to the central warehouse to view the corresponding jar format;

3, open the address of two central warehouse, personal feeling http://repo1.maven.org/maven2/resources to a whole

MAVEN uses notes to load json-lib issues