build run edits

docs/pages/Building-&-Running.md

@@ -38,17 +38,18 @@ To run *nshmp-haz* web services:
 
 ```bash
 ./gradlew run
+# or './gradlew run -t' to recompile and relaunch when code changes
 ```
 
 By default, when the web services start up, they load the 2018 NSHM for the conterminous U.S.
 To use a different model run the web services using Java and specify model path:
 
 ```bash
+./gradlew assemble
 java -jar build/libs/nshmp-haz.jar --model=path/to/model
 ```
 
-After startup, web services and documentation are now available at
-[http://localhost:8080/](http://localhost:8080/).
+After startup, web services and documentation are available at <http://localhost:8080/>.
 
 See the [Matlab](../../etc/matlab) directory for examples of how to call the web services. To
 run the ground motion model (GMM) web services, please use the
@@ -89,6 +90,32 @@ Disaggregations build on and output `HazardCalc` results along with other disagg
 files. Disaggregations also have some independent
 [configuration](./Calculation-Configuration.md#calculation-configuration-parameters) options.
 
+## Customizing Code
+
+Whereas *nshmp-haz* contains code to run command line applications and web services, model
+loading and hazard calculations are handled in the dependent library
+[*nshmp-lib*](https://code.usgs.gov/ghsc/nshmp/nshmp-lib). To use a local, modified version of
+*nshmp-lib*, set an environment variable `NSHMP_LIB_LOCAL=true` and *nshmp-haz*
+will look for *nshmp-lib* in a directory adjacent to *nshmp-haz*. If *nshmp-lib* is located
+somewhere else, modify the path specified in
+[`gradle/dependencies.gradle`](../../gradle/dependencies.gradle). When using a local version
+of *nshmp-lib*, first build the *nshmp-lib* project using `./gradlew fatJar` so that
+required dependencies are included.
+
+Summary of steps to check out and start running code for local development:
+
+```bash
+# --> Set a NSHMP_LIB_LOCAL=true environment variable on your system
+cd yourProjectDirectory
+git clone https://code.usgs.gov/ghsc/nshmp/nshmp-lib.git
+cd nshmp-lib
+./gradlew fatJar
+cd ..
+git clone https://code.usgs.gov/ghsc/nshmp/nshmp-ws.git
+cd nshmp-ws
+./gradlew run
+```
+
 ---
 
 ## Related Pages