eclipse不能在jar中为Google api客户端找到类

Question

I have a project that uses google calendar. I built the original code in a separate project that used maven.

This is the maven artifact:

 <dependency> <groupId>com.google.api-client</groupId> <artifactId>google-api-client</artifactId> <version>1.22.0</version> </dependency> 

Works just fine.

I then import the code into another project that doesn't use maven. I go to the maven website and download THIS SAME JAR. I go to Project -> Properties -> Build Path -> Add External Jars and add this jar.

I go Project -> Clean and build the project.

The result? Classes such as: com.google.api.client.util.store.DataStore and com.google.api.client.util.store.DataStoreFactory

CANNOT BE RESOLVED!

I know they are in the jar because I just used it with maven!

Any help on this?

Answer 1

You have this problem because google-api-client requires

Google HTTP Client Library for Java

Google OAuth Client Library for Java

You did not face this problem in maven as maven downloaded them for you internally. Maven resolves transitive dependencies ie (dependencies that are required for your jar) internally. You did not see that coming.

You can download both from here :

google-http-client

google-oauth-client

Have a look at maven's dependency resolution mechanism here

Have a look here to get idea of the required dependencies for your current api to work:

https://github.com/google/google-api-java-client/tree/c7421ae143c45b3e75c2bd6dcc86eba0d39bcf59#dependencies