https://bz.apache.org/bugzilla/show_bug.cgi?id=64849
Bug ID: 64849
Summary: Embedded EL module descriptor missing uses and
provides clauses
Product: Tomcat 9
Version: 9.0.39
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P2
Component: EL
Assignee: dev@tomcat.apache.org
Reporter: rob.pl...@dai.co.uk
Target Milestone: -----
Tomcat Embedded EL has a bug closely related to one reported and fixed to the
core module, issue 64751 "Incomplete module info descriptor". This is the
stacktrace:
java.util.ServiceConfigurationError: javax.el.ExpressionFactory: module
org.apache.tomcat.embed.el does not declare `uses`
[ERROR] at
java.base/java.util.ServiceLoader.fail(ServiceLoader.java:588)
[ERROR] at
java.base/java.util.ServiceLoader.checkCaller(ServiceLoader.java:574)
[ERROR] at
java.base/java.util.ServiceLoader.<init>(ServiceLoader.java:503)
[ERROR] at
java.base/java.util.ServiceLoader.load(ServiceLoader.java:1646)
[ERROR] at
org.apache.tomcat.embed.el@9.0.39/javax.el.ExpressionFactory.getClassNameServices(ExpressionFactory.java:372)
[ERROR] at
org.apache.tomcat.embed.el@9.0.39/javax.el.ExpressionFactory.discoverClassName(ExpressionFactory.java:330)
[ERROR] at
org.apache.tomcat.embed.el@9.0.39/javax.el.ExpressionFactory.newInstance(ExpressionFactory.java:134)
[ERROR] at
org.apache.tomcat.embed.el@9.0.39/javax.el.ExpressionFactory.newInstance(ExpressionFactory.java:86)
Looking at module-info.java and the contents of META-INF/services I think there
are two missing lines for this module descriptor; not just the uses clause, but
also and the provides clauses. Both of these lines need adding:
uses javax.el.ExpressionFactory;
provides javax.el.ExpressionFactory with org.apache.el.ExpressionFactoryImpl;
Both lines are necessary to recreate the service provider / loader mechanism
with the module system; ExpressionFactory has static methods to look up the
implementation (as part of the public newInstance method), so the module uses
its own provided implementation.
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