steinarb commented on issue #2083:
URL: https://github.com/apache/shiro/issues/2083#issuecomment-2799994599
The core of the problem is this:
```
Caused by: org.apache.shiro.lang.util.UnknownClassException: Unable to load
class named [org.apache.shiro.subject.SimplePrincipalCollection] from the
thread context, current, or system/application ClassLoaders. All heuristics
have been exhausted. Class could not be found.
at
org.apache.shiro.lang.io.ClassResolvingObjectInputStream.resolveClass(ClassResolvingObjectInputStream.java:55)
~[!/:2.0.2]
```
The class ClassResolvingObjectInputStream is in the shiro-lang OSGi bundle
(i.e. jar file with import-package and export-package declarations in the
MANIFEST.MF).
For a class to be loaded and, found by ClassResolvingObjectInputStream, the
package the class resides (i.e. org.apache.shiro.subject for
SimplePrincipalCollection) in needs to be imported into shiro-lang.
And the package org.apache.shiro.subject (found in shiro-core) is not listed
in the Import-Package declaration of the shiro-lang MANIFEST.MF (formatted for
readability):
```
Import-Package:
javax.servlet.jsp;resolution:=optional,
java.beans,
java.io,
java.lang,
java.lang.annotation,
java.lang.invoke,
java.lang.ref,
java.lang.reflect,
java.net,
java.text,
java.util,
java.util.concurrent,
java.util.concurrent.locks,
org.apache.shiro.lang;version="[2.0,3)",
org.apache.shiro.lang.codec;version="[2.0,3)",
org.apache.shiro.lang.util;version="[2.0,3)",
org.slf4j;version="[2.0,3)"
```
Below is the export-package of the MANIFEST.MF of shiro-core, also
reformatted for readability, and I see one obvious problem: packages in
shiro-core require packages from shiro-lang (which means shiro-lang can't
import packages from shiro-core, because then you would have a loop).
So this requires changes to shiro to fix.
There are two ways of breaking the loop:
1. Put everything in one huge jar (the quick and dirty and wrong way)
2. Split out the stuff included both places into a separate bundle and
import its packages in the bundles that need it
Export-package of the MANIFEST.MF of shiro-core, reformatted for readability:
```
Export-Package:
org.apache.shiro;version="2.0.2";uses:="org.apache.shiro.lang,org.apache.shiro.mgt,org.apache.shiro.subject",
org.apache.shiro.aop;version="2.0.2";uses:="org.apache.shiro.subject",org.apache.shiro.authc;version="2.0.2";uses:="org.apache.shiro.authz,org.apache.shiro.lang,org.apache.shiro.lang.util,org.apache.shiro.subject",
org.apache.shiro.authc.credential;version="2.0.2";uses:="org.apache.shiro.authc,org.apache.shiro.crypto.hash,org.apache.shiro.crypto.hash.format,org.apache.shiro.lang.codec,org.apache.shiro.lang.util",
org.apache.shiro.authc.pam;version="2.0.2";uses:="org.apache.shiro.authc,
org.apache.shiro.realm,org.apache.shiro.subject",
org.apache.shiro.authz;version="2.0.2";uses:="org.apache.shiro.authz.permission,org.apache.shiro.lang,org.apache.shiro.realm,org.apache.shiro.subject",
org.apache.shiro.authz.annotation;version="2.0.2",
org.apache.shiro.authz.aop;version="2.0.2";uses:="org.apache.shiro.aop,org.apache.shiro.authz",
org.apache.shiro.authz.permission;version="2.0.2";uses:="org.apache.shiro.authz,org.apache.shiro.lang",
org.apache.shiro.concurrent;version="2.0.2";uses:="org.apache.shiro.subject",
org.apache.shiro.dao;version="2.0.2";uses:="org.apache.shiro.lang",org.apache.shiro.env;version="2.0.2";uses:="org.apache.shiro.config,org.apache.shiro.lang,org.apache.shiro.lang.util,org.apache.shiro.mgt",
org.apache.shiro.ini;version="2.0.2";uses:="org.apache.shiro.config,org.apache.shiro.config.ogdl,org.apache.shiro.mgt,org.apache.shiro.realm,org.apache.shiro.util",
org.apache.shiro.jndi;version="2.0.2";uses:="javax.naming,org.apache.shiro.lang.util",
org.apache.shiro.ldap;version="2.0.2";uses:="org.apache.shiro.dao",
org.apache.shiro.mgt;version="2.0.2";uses:="org.apache.shiro.authc,org.apache.shiro.authz,org.apache.shiro.cache,org.apache.shiro.crypto.cipher,org.apache.shiro.event,org.apache.shiro.lang.io,org.apache.shiro.lang.util,org.apache.shiro.realm,org.apache.shiro.session,org.apache.shiro.session.mgt,org.apache.shiro.subject",
org.apache.shiro.realm;version="2.0.2";uses:="org.apache.shiro.authc,org.apache.shiro.authc.credential,org.apache.shiro.authz,org.apache.shiro.authz.permission,org.apache.shiro.cache,org.apache.shiro.lang.util,org.apache.shiro.subject",
org.apache.shiro.realm.activedirectory;version="2.0.2";uses:="javax.naming,javax.naming.ldap,org.apache.shiro.authc,org.apache.shiro.authz,org.apache.shiro.realm.ldap,org.apache.shiro.subject",
org.apache.shiro.realm.jdbc;version="2.0.2";uses:="javax.sql,org.apache.shiro.authc,org.apache.shiro.authz,org.apache.shiro.realm,
org.apache.shiro.subject",
org.apache.shiro.realm.jndi;version="2.0.2";uses:="org.apache.shiro.jndi,org.apache.shiro.realm",
org.apache.shiro.realm.ldap;version="2.0.2";uses:="javax.naming,javax.naming.directory,javax.naming.ldap,org.apache.shiro.authc,org.apache.shiro.authz,org.apache.shiro.realm,org.apache.shiro.subject",
org.apache.shiro.realm.text;version="2.0.2";uses:="org.apache.shiro.config,org.apache.shiro.lang.util,org.apache.shiro.realm",
org.apache.shiro.session;version="2.0.2";uses:="org.apache.shiro.lang",
org.apache.shiro.session.mgt;version="2.0.2";uses:="org.apache.shiro.authz,org.apache.shiro.cache,org.apache.shiro.event,org.apache.shiro.lang.util,org.apache.shiro.session,org.apache.shiro.session.mgt.eis,org.apache.shiro.util",
org.apache.shiro.session.mgt.eis;version="2.0.2";uses:="org.apache.shiro.cache,org.apache.shiro.session",
org.apache.shiro.subject;version="2.0.2";uses:="org.apache.shiro.authc,org.apache.shiro.authz,org.apache.shiro.lang,org.apache.shiro.mgt,org.apache.shiro.session",
org.apache.shiro.subject.support;version="2.0.2";uses:="org.apache.shiro.authc,org.apache.shiro.authz,org.apache.shiro.mgt,org.apache.shiro.session,org.apache.shiro.session.mgt,org.apache.shiro.subject,org.apache.shiro.util",
org.apache.shiro.util;version="2.0.2";uses:="org.apache.shiro.authz,org.apache.shiro.authz.permission,org.apache.shiro.lang.util,org.apache.shiro.mgt,org.apache.shiro.subject!"
```
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