Unable to create spreadsheet, Java error

I'm trying to create a spreadsheet for the first time in CF 9. It doesn't look like the spreadsheet is getting generated at all. I get no errors or output of any sort, but in the ColdFusion Monitor, it logs an error "java.lang.Error : Could not find class: com.gp.java2d.ExHeadlessGraphicsEnvironment". This is my very stripped down test case:

<cfscript>
    oSheet = SpreadsheetNew( "mysheet", true );
    SpreadsheetSetCellValue( oSheet, "foo", 1, 1);
    SpreadsheetAddRow( oSheet, "a,b,c", 2, 1 );    
</cfscript>

<cfdump var="#oSheet#">

I do get output from the cfdump on my local machine using the CF Developer edition, but not on my Linux webserver.