Sloppy, another Maven packing problem

Yin Jihuan 2020-11-06 01:17:09
sloppy maven packing problem


I often meet Maven Related issues , This is the previous article :

One more today , First look at the error message , I'm familiar with , They're old friends , It's the same smell that used to be .

  1. Caused by: java.lang.ClassNotFoundException: net.sf.json.JSONException
  2. at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
  3. at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
  4. at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
  5. at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
  6. ... 57 more

Depends on aliyun-log,aliyun-log Internal dependence json-lib, as follows :

  1. <dependency>
  2. <groupId>net.sf.json-lib</groupId>
  3. <artifactId>json-lib</artifactId>
  4. <version>2.4</version>
  5. <classifier>jdk15</classifier>
  6. </dependency>

There's no problem in terms of dependence , Then look at the packaged server lib Is there... In the catalog json-lib This jar package . After a look, there is json-lib-2.4.jar.
The mistake clearly tells us JSONException Can't find , That is, it is not loaded into json-lib My bag , We need to take a look at this time MANIFEST.MF In file Class-Path Is there any setting json-lib The path of .

Looked at the , There's a corresponding path , The value is json-lib-2.4-jdk15.jar, You can see , This name is not consistent with the package , More jdk15.

At this time, let's go back to the above classifier, It specifies jdk15.classifier Usually used to distinguish between different jdk Version generated jar package , If you specify classifier, that jar That is to add classifier That's what it's worth , That is to say json-lib-2.4-jdk15.jar That's right. .

Now the problem is obvious , It's about packing , After packaging jar Name should be json-lib-2.4-jdk15.jar That's right , And now, json-lib-2.4.jar, That led to ClassNotFoundException.

Then I looked at the packaging of the project , It's still older assembly, It's packed inside jar Modified the name .

  1. <outputFileNameMapping>${artifact.artifactId}-${artifact.baseVersion}.${artifact.extension}</outputFileNameMapping>

The format is fixed ,classifier Not in the format , So packed jar The name will be changed . The solution needs to put classifier It's also defined in outputFileNameMapping in .

however classifier This is not every one jar All have , If used directly artifact.classifier You can't , No, classifier There will be problems with , There needs to be a judgment here . And then I found one to splice , Don't use it if you don't have it \${dashClassifier?}, Perfect solution .

  1. <outputFileNameMapping>${artifact.artifactId}-${artifact.baseVersion}${dashClassifier?}.${artifact.extension}</outputFileNameMapping>

Document reference :

http://maven.apache.org/plugins/maven-ear-plugin/examples/customize-file-name-mapping.html

About author : Yin Jihuan , Simple technology enthusiasts ,《Spring Cloud Microservices - Full stack technology and case analysis 》, 《Spring Cloud Microservices introduction Actual combat and advanced 》 author , official account Ape world Originator .

I have compiled a complete set of learning materials , Those who are interested can search through wechat 「 Ape world 」, Reply key 「 Learning materials 」 Get what I've sorted out Spring Cloud,Spring Cloud Alibaba,Sharding-JDBC Sub database and sub table , Task scheduling framework XXL-JOB,MongoDB, Reptiles and other related information .

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