You may run jAmaSeis without a GUI in headless mode. To run a Java program in headless mode you need to add "-Djava.awt.headless=true" to the command line arguments such as:

java -Djava.awt.headless=true -Xmx1024m -jar jAmaseis.jar


To edit the configuration you normally need to run with a GUI in order to modify the Java preferences.

On Ubuntu Linux (should be the same for others as well) the configuration is normally found under the "~/.java/.userPrefs/edu/iris/epo/jamaseis/options" directory. The settings are in "prefs.xml" in the top directory and the sources are in "prefs.ml" under a source directory e.g., source0.

For Windows and Mac you can also have Java use the Linux file preferences instead of the registry or plist file by starting jAmaSeis with the following command:

java -Djava.util.prefs.PreferencesFactory=java.util.prefs.FileSystemPreferencesFactory -Xmx1024m -jar jAmaseis.jar

For the Linux file preferences the directory may be specified by setting the java.util.prefs.userRoot property:

mkdir /Users/kevin/jamaseis/userPrefs
java -Djava.util.prefs.PreferencesFactory=java.util.prefs.FileSystemPreferencesFactory -Djava.util.prefs.userRoot=/Users/kevin/jamaseis/userPrefs -Xmx1024m -jar jAmaseis.jar


Example preferences files:

prefs.xml
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!DOCTYPE map SYSTEM "http://java.sun.com/dtd/preferences.dtd">
<map MAP_XML_VERSION="1.0">
  <entry key="computerLatitude" value="42.527"/>
  <entry key="computerLocation" value="Leominster, MA"/>
  <entry key="computerLongitude" value="-71.754"/>
  <entry key="dataLocation" value="/Users/kevin/jamaseisData/"/>
  <entry key="fulScreenDisplay" value="false"/>
  <entry key="isConfigured" value="true"/>
  <entry key="numLines" value="4"/>
  <entry key="userLocationAwareness" value="true"/>
</map>

source0//prefs.xml:
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!DOCTYPE map SYSTEM "http://java.sun.com/dtd/preferences.dtd">
<map MAP_XML_VERSION="1.0">
  <entry key="commport" value="/dev/tty.usbserial-AD02733B"/>
  <entry key="device" value="0"/>
  <entry key="deviceInterval" value="0.166"/>
  <entry key="deviceName" value="AS-1"/>
  <entry key="elevation" value="100.0"/>
  <entry key="id" value="ISTI"/>
  <entry key="isNetworkSend" value="true"/>
  <entry key="isScreenShot" value="false"/>
  <entry key="latitude" value="42.527"/>
  <entry key="location" value="Leominster, MA"/>
  <entry key="longitude" value="-71.754"/>
  <entry key="name" value="ISTI"/>
  <entry key="password" value="mypassword"/>
  <entry key="propertiesType" value="local"/>
  <entry key="screenshotInterval" value="600000"/>
  <entry key="startupString" value=""/>
  <entry key="zeroValue" value="2048"/>
</map>