Unable to Compile JSP Page on Resource-Constrained Servers. (ID 6184122)

The JSP page is accessed but fails to compile, and the server log contains the error message “Unable to execute command” with the following stack trace:

at org.apache.tools.ant.taskdefs.Execute$Java13CommandLauncher.
exec(Execute.java:655) at org.apache.tools.ant.taskdefs.Execute.
launch(Execute.java:416) 
at org.apache.tools.ant.taskdefs.Execute.execute(Execute.java:427) 
at org.apache.tools.ant.taskdefs.compilers.DefaultCompilerAdapter.
executeExternalCompile(DefaultCompilerAdapter.java:448) 
at org.apache.tools.ant.taskdefs.compilers.JavacExternal.execute
(JavacExternal.java:81) 
at org.apache.tools.ant.taskdefs.Javac.compile(Javac.java:842) 
at org.apache.tools.ant.taskdefs.Javac.execute(Javac.java:682) 
at org.apache.jasper.compiler.Compiler.generateClass(Compiler.java:396)

Solution

Set the JSP compilation switch "fork" to "false."

You can activate this setting in either of two ways:

• Globally, by setting the fork init parameter of the JspServlet in ${S1AS_HOME}/domains/domain1/config/default-web.xml to false:

  <servlet> <servlet-name>jsp</servlet-name> <servlet-class>org.apache.jasper.servlet.JspServlet</servlet-class> .... <init-param> <param-name>fork</param-name> <param-value>false</param-value> </init-param> .... </servlet>

• On a per-web application basis, by setting the fork JSP configuration property in sun-web.xml to false:

  <sun-web-app> <jsp-config> <property name="fork" value="false" /> </jsp-config> </sun-web-app>

Either setting prevents Ant from spawning a new process for javac compilation.