picoextras-pool tests fails to compile

java:prepare-filesystem:
[mkdir] Created dir: D:\java\development\opensource\codehaus\picoextras\pool\target\classes

java:compile:
[echo] Compiling to D:\java\development\opensource\codehaus\picoextras\pool/target/classes
[javac] Compiling 6 source files to D:\java\development\opensource\codehaus\picoextras\pool\target\classes
Note: D:\java\development\opensource\codehaus\picoextras\pool\src\java\org\picoextras\pool\DefaultPicoPool.java uses or
overrides a deprecated API.
Note: Recompile with -deprecation for details.

java:jar-resources:

test:prepare-filesystem:
[mkdir] Created dir: D:\java\development\opensource\codehaus\picoextras\pool\target\test-classes
[mkdir] Created dir: D:\java\development\opensource\codehaus\picoextras\pool\target\test-reports

test:test-resources:

test:compile:
[javac] Compiling 1 source file to D:\java\development\opensource\codehaus\picoextras\pool\target\test-classes
D:\java\development\opensource\codehaus\picoextras\pool\src\test\org\picoextras\pool\PicoPoolTestCase.java:204: cannot r
esolve symbol
symbol : method wilma ()
location: class org.picoextras.testmodel.FredImpl
assertNotNull(((FredImpl) borrowed).wilma());
^
D:\java\development\opensource\codehaus\picoextras\pool\src\test\org\picoextras\pool\PicoPoolTestCase.java:228: cannot r
esolve symbol
symbol : method wilma ()
location: class org.picoextras.testmodel.FredImpl
assertNotNull(((FredImpl) borrowed).wilma());
^
2 errors

BUILD FAILED
File...... file:/D:/java/development/opensource/codehaus/picoextras/
Element... maven:reactor
Line...... 27
Column.... 7