Declare a non-nillable element. Try xsi:nil="true".The test is negative.
http://www.w3.org/TR/2001/REC-xmlschema-1-20010502/#cElement_Declarations
TEST nillable00201m - nillable=false and xsi:nil=true (valid schema)
| Item | Value | 
|---|---|
| title | nillable00201m - nillable=false and xsi:nil=true (valid schema) | 
| name | nillable00201m | 
| source | ../nillable00201m.xsd | 
| schemaName | ../nillable00201m.xsd | 
| executeClass | com.sun.jaxb_tck.sigtest.JAXBTest | 
| executeArgs | -TestURL $testURL -Plugin com.sun.jaxb_tck.sigtest.JaxbPlugin -FileName nillable00201m.sig -PackageWithoutSubpackages $package | 
| keywords | schema positive | 
| package | javasoft.sqe.tests.elemdecl.nillable.nillable00201m.nillable00201m | 
| signature | nillable00201m.sig | 
TEST nillable00201m3_p - nillable=false and xsi:nil=true (valid schema)
| Item | Value | 
|---|---|
| title | nillable00201m3_p - nillable=false and xsi:nil=true (valid schema) | 
| name | nillable00201m3_p | 
| source | ../nillable00201m.xsd | 
| schemaName | ../nillable00201m.xsd | 
| executeClass | javasoft.sqe.tests.api.jakarta.xml.bind.JAXBTest | 
| executeArgs | -TestURL $testURL -package $package -out :ref -document ../nillable00201m3_p.xml -pcontent nillable00201m-nillable00201m3_p.jbx | 
| keywords | positive document | 
| package | javasoft.sqe.tests.elemdecl.nillable.nillable00201m.nillable00201m | 
| document | ../nillable00201m3_p.xml | 
| jb-context | nillable00201m-nillable00201m3_p.jbx |