Mike
On Monday, June 2, 2003, at 10:54 AM, Ias wrote:
The current 2.0 beta 1 distribution doesn't work with Tomcat 4.x. The
error message is
Catalina.start: LifecycleException: Missing optional package
Extension[junit,
implementationURL=http://www.ibiblio.org/maven/junit/jars/junit- 3.8.1.ja
r, implementationVersion=3.8.1]
LifecycleException: Missing optional package Extension[junit,
implementationURL=http://www.ibiblio.org/maven/junit/jars/junit- 3.8.1.ja
r, implementationVersion=3.8.1]
at
org.apache.catalina.loader.WebappLoader.validatePackages(WebappLoader.j a
va:1244)
at
org.apache.catalina.loader.WebappLoader.start(WebappLoader.java:645)
at
org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1100)
at
org.apache.catalina.core.StandardContext.start(StandardContext.java:334 5
)
at
org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1123)
at
org.apache.catalina.core.StandardHost.start(StandardHost.java:614)
at
org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1123)
at
org.apache.catalina.core.StandardEngine.start(StandardEngine.java:343)
at
org.apache.catalina.core.StandardService.start(StandardService.java:388 )
at
org.apache.catalina.core.StandardServer.start(StandardServer.java:506)
at org.apache.catalina.startup.Catalina.start(Catalina.java:781)
at
org.apache.catalina.startup.Catalina.execute(Catalina.java:681)
at
org.apache.catalina.startup.Catalina.process(Catalina.java:179)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.ja v
a:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccesso r
Impl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at
org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:243)
I looked into the stack trace and found that there needed to be some modification toward the associated jars-commons-httpclient-2.0-beta1.jar, junit-3.8.1.jar, and commons-logging-1.0.jar.
First, Tomcat's org.apache.catalina.loader.Extension.getRequired distinguishes required libraries by delimiter not "," but " ". Therefore,
Extension-List: junit,commons-logging
should be
Extension-List: junit commons-logging
in MANIFEST.MF of httpclient jar. (http://java.sun.com/j2se/1.4.1/docs/guide/extensions/versioning.html proves the usage.)
Next, since Tomcat's resolving algorithm for required libraries is quite
strict as implemented in o.a.c.l.WebappLoader.validatePackages(),
Specification-Version and Implementation-Vendor-Id of the extensions
should be defined like this:
junit-Extension-Name: junit
junit-Specification-Version: 3.8.1
junit-Implementation-Vendor-Id:
junit-Implementation-Version: 3.8.1
junit-Implementation-URL:
http://www.ibiblio.org/maven/junit/jars/junit-3.8.1.jar
commons-logging-Extension-Name: org.apache.commons.logging
commons-logging-Specification-Version: 1.0
commons-logging-Implementation-Vendor-Id:
commons-logging-Implementation-Version: 1.0.2
commons-logging-Implementation-URL:
http://www.ibiblio.org/maven/commons-logging/jars/commons-logging- 1.0.2.
jar
In accordance with the above addition, MANIFEST of junit and commons-logging also should be updated to comply with commons-httpclient.
Manifest-Version: 1.0 Created-By: Ant 1.4.1 Extension-Name: junit Specification-Version: 3.8.1 Implementation-Vendor-Id: Implementation-Version: 3.8.1
Manifest-Version: 1.0 Created-By: Apache Ant 1.5.1beta1 Extension-Name: org.apache.commons.logging Specification-Vendor: Apache Software Foundation Specification-Version: 1.0 Implementation-Vendor: Apache Software Foundation Implementation-Vendor-Id: Implementation-Version: 1.0.2 Class-Path: log4j.jar log4j-core.jar
Otherwise, you can figure out this conflict by simply removing
Extension-List and its followings. The attached files are completely
updated MANIFESTs. Again, I'd like to remind you that this issue is now
only proved to be relevant with Tomcat and hence am not sure it can
cause a problem under other platforms. (I saw my colleague using
http-client 2.0 beta 1 on his dos prompt without trouble even though his
classpath didn't include junit.jar.)
Thanks for this great work, http-client 2.0,
Ias.
=========================================================== Lee, Changshin (Korean name) Ias (International name) Company Web Site: http://www.tmax.co.kr Personal Web Site: http://www.iasandcb.pe.kr ---------------------------------------------------------
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