How To Set Build Path In Eclipse

Eclipse Java Evolution User Guide
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Java Build Path

The options in this page indicate the build path settings for a Coffee project. You can reach this page through the project properties (Project > Properties > Coffee Build Path) from the context menu on a created projection or the File carte du jour of the workbench.

The build class path is a list of paths visible to the compiler when edifice the project.

Source tab

Source folders are pinnacle-level folders in the project bureaucracy. They are the root of packages containing .java files. The compiler will translate the contained files to .class files that will exist written to the output binder.

Source folders allow to structure the project, for example to split up test from the application in two source folders. Within a source binder, a more than detailed structuring can be acived by using packages.

Each source folder can define an exclusion filter to specify which resources within the folder should not be visible to the compiler.

Resource existing in source folders are copied to the output binder unless the setting in the Java > Compiler > Building preference folio specifies that the resource is filtered. The output folder is divers per project except if a source folder specifies its ain output folder.

Source folder options:

Choice	Description
Add Folder	Creates a new folder to contain source
Link Source	Creates a new folder that links to an location outside of the workspace
Edit	Allows to modify the currently selected source folder or source folder attribute.
Remove	Removes the selected folders from the class path. This does not delete the folders nor their contents.
Allow output folder per source folder	Shows/Hides the 'output folder' attribute of the source folders

Source folder attributes:

Aspect	Description
Exclusion filter	Selects which resource are not visible to the compiler
Output folder	Only available when Let output binder per source binder is checked. Defines a source folder specific output location. If not set the project's default output folder is used.
Native library location	Defines the folder that contains the native libararies (for example 'dll' or 'o' files) required at runtime by the sources in the source folder.

At the bottom of this folio, the Default output binder field allows you to enter a path to a folder path where the compilation output for this project will reside. The default output is used for source folders that do not specify an own output folder. Use Browse to select an existing location from the current project.

Projects tab

In the Required projects on the build path listing, you lot can add project dependencies by selecting other workbench projects to add to the build path for this new project.

Adding a required project indirectly adds all its classpath entries marked as 'exported'. Setting a classpath entry as exported is done in the Order and Export tab.

The projects selected here are automatically added to the referenced projects list. The referenced project listing is used to determine the build order. A project is e'er build after all its referenced projects are built.

Action	Clarification
Add	Add together another project in the workspace to the build path of this projection.
Edit	Edit the classpath attribute of a required project.
Remove	Removes the selected required projects from the list.

Project entry attributes:

Attribute	Description
Native library location	Specifies where native library required for the project to operate can be found.
Access rules	Specifies access rules for project contained in the library. This allows to hide content of a project.

Libraries tab

On this folio, you can add together libraries to the build path.

By default, the library list contains an entry representing the Java runtime library. This entry points to the JRE selected as the default JRE. The default JRE is configured in the Java > Debug > Installed JREs preferences page.

Libraries tab options:

Option	Description
Add JARs	Allows you to navigate the workbench hierarchy and select JAR files to add to the build path.
Add together External JARs	Allows yous to navigate the file organisation (outside the workbench) and select JAR files to add to the build path.
Add Variable	Allows you to add classpath variables to the build path. Classpath variables are an indirection to JARs with the do good of avoiding local file arrangement paths in a classpath. This is needed when projects are shared in a team. Variables can be created and edited in the Java > Build Path > Classpath Variables preference page.
Add together Library	Allows to add a predefined libraries similar the JRE System Library. Such libraries can correspond an arbitrary number of entries (visible as children node of the library node)
Add Class Folder	Allows to navigate the workbench bureaucracy and select a class folder for the build path. The choice dialog also allows you to create a new folder.
Add together External Class Folder	Allows to navigate the file system (outside the workbench) and select a class folder for the build path. The selection dialog also allows you to create a new folder.
Edit	Allows yous to modify the currently selected library entry or entry attribute
Remove	Removes the selected element from the build path. This does non delete the resource.
Migrate JAR File	Migrate a JAR on the build path to a newer version. If the newer version contains refactoring scripts the refactoring stored in the script will be executed.

 Libraries accept the following attributes (presented every bit library entry children nodes):

Library entry attributes:

Attribute	Description
Javadoc location	Specifies where the library's Javadoc documentation can be found. If specified you can use Shift+F2 on an element of this library to open its documentation.
Source attachment	Specifies where the library's source tin can be found.
Native library location	Specifies where native library required for the library to operate can be found.
Access rules	Specifies access rules for resources independent in the library. This allows to hide content of a library.

Order and Export tab

In the Build course path order list, you lot can click the Upwardly and Down buttons to move the selected path entry upwards or downwardly in the build path order for this new project.

Checked list entries are marked as exported. Exported entries are visible to projects that require the projection. Utilize the Select All and Deselect All to change the checked state of all entries. Source folders are ever exported, and tin can non be deselected.

Build classpath
Classpath variables

Frequently asked questions on JDT
Classpath variables preferences
Build path preferences
Compiler preferences

Source: https://www.linuxtopia.org/online_books/eclipse_documentation/eclipse_java_development_guide/topic/org.eclipse.jdt.doc.user/reference/eclipse_java_ref-properties-build-path.htm

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