Ctrl + Shift + R : find resource
Ctrl + Shift + T : find type
Ctrl + O : find method, variable in a class file
Ctrl + L : go to a specific line number
Ctrl + H: text search
F5 : step into
F6 : step over
F8: resume
Ctrl + Alt + H : to find where all a method is called
Ctrl + Shift + G : find where a method is used
right-click on a class, select references/Project: to find where all a class is used
Convert a project to Java project
Right click on the project
Go to Properties > Project Facets
Select Java and apply
Check where all a class method is used
Select the class/method
Right click references/project
Change/Set JDK path to be used
Open eclipse.ini file in eclipse home folder
Change value for -vm setting
-vm
C:\Program Files\Java\jdk1.8.0_191\bin\javaw.exe
1) This compilation unit is not on the build path of a Java project.
Add the following in .project file
<natures>
<nature>org.eclipse.jdt.core.javanature</nature>
</natures>
Clean the project and build again.
2) Missing Maven dependencies in Eclipse project
Open .classpath file at the root of the project
Add following
<classpathentry kind="con" path="org.eclipse.m2e.MAVEN2_CLASSPATH_CONTAINER">
<attributes>
<attribute name="maven.pomderived" value="true"/>
<attribute name="org.eclipse.jst.component.nondependency" value=""/>
</attributes>
</classpathentry>
Rebuild project (Project> Clean and Build)
Right Click on project > Properties> Java Build Path > Libraries
Maven Dependencies will be listed now
3) .class file opens instead of .java while debugging
Select project
Run > Debug Configuration > Source
Remove Default and select your project
