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This article mainly introduces "what is the function of Order and Export tabs under Eclipse java build path". In daily operation, I believe that many people have doubts about the role of Order and Export tabs under Eclipse java build path. The editor consulted all kinds of materials and sorted out simple and easy-to-use methods of operation. I hope it will be helpful for you to answer the doubts of "what is the role of Order and Export tabs under Eclipse java build path?" Next, please follow the editor to study!

Right click on the Eclipse web project-> Build path-> Configure Build Path-> Order and Export

Describe the problem first. Question 1:

In the eclipse maven project, you can see that the source package src/main/java is not shown in the first line, and the display order of the directory structure on the left is the same as that of Order and Export.

It can be seen that the first function of Order and Export is to determine the display order of the project directory structure on the left.

Question 2:

If the project catalog is displayed in the order shown above, publish the project to tomcat and run it at this time, and find that the console reports various ClassNotFoundException

Check it out in the tomcat release directory, usually in .metadata.plugins\ org.eclipse.wst.server.core\ tmp0\ wtpwebapps

Found that WEB-INF\ classes directory are empty folders, compiled class files have not been released, tomcat naturally can not find class, so the error.

At this time, display the src/main/java directory on the top and apply, republish, and find the compiled class file in the WEB-INF\ classes directory. Start tomtcat again at this time, and everything will be fine.

Thus it can be seen that the second function of Order and Export is to determine the release order of web project class files, configuration files, and jre/maven dependencies.

Summary

Order and Export consists of two parts

Order: project catalog sorted display on the left

Export:Tomcat release order

As for why the release of src/main/java will lead to the release of class files, it is not clear why.

At this point, the study on "what is the function of Order and Export tabs under Eclipse java build path" is over. I hope to be able to solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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