# Java Building Preferences

Indicate your preferences for the Building settings on the Java > Compiler > Building preference page.

### General

Option | Description | Default
--- | --- | ---
Maximum number of reported problems per compilation unit | Specifies how many problems should be reported for a compilation unit. | 100
Enable use of exclusion patterns in source folders | When disabled, no entry on a project classpath can be associated with an exclusion pattern. | On
Enable use of multiple output locations for source folders | When disabled, no entry on a project classpath can be associated with a specific output location, preventing thus usage of multiple output locations. | On

### Build path problems

Abort build when build path errors occur | Allow to toggle the builder to abort if the classpath is invalid. | On
Incomplete build path | Indicate the severity of the problem reported when an entry on the classpath does not exist, is not legitimate or is not visible (e.g. a reference project is closed). | Error
Circular dependencies | Indicate the severity of the problem reported when a project is involved in a cycle. | Error
Incompatible required binaries | Indicated the severity of the problem reported when a project requires incompatible binaries. | Ignore
Output location overlaps source location | Indicated the severity of the problem reported when a source entry's output location overlaps another source entry. | Error
No strictly compatible JRE for execution environment available | Indicate the severity of the problem reported when a project prerequisites another project or library with an incompatible target JDK level (e.g. project targeting 1.1 vm, but compiled against 1.4 libraries). | Ignore

### Output folder

Duplicated resources | Indicate the severity of the problem reported when more than one occurrence of a resource is to be copied into the output location. | Warning
Scrub output folders when cleaning projects | Indicate whether the Java Builder is allowed to clean the output folders when performing full build operations. | On
Rebuild class files modified by others | Indicate whether class files which have been modified by others should be rebuilt to undo the modification. | Off
Filtered resources | A comma separated list of file patterns which are not copied to the output folder. | Empty

Java builder
Inclusion and exclusion patterns
Build classpath