Unable to start servlet java.lang.NoClassDefFoundError: org/springframework/core/io/Resource

[Jelle de Jong]

Hello everybody,

Does someone see what I am doing wrong here... Is this a java compilation issue or a config file error that can cause this? Thank you in advance.

full error:

https://github.com/iwayvietnam/zm-sso/issues/6#issuecomment-1261481499

config:

https://github.com/iwayvietnam/zm-sso/issues/6#issuecomment-1262143141

2022-09-28 23:23:50,385 INFO [main] [] extensions - Initialized extension clamscanner: com.zimbra.clam...@com.zimbra.cs.extension.ZimbraExtensionClassLoader@121c1a08 2022-09-28 23:23:50,392 INFO [main] [] extensions - Create sso session table 2022-09-28 23:23:50,397 INFO [main] [] extensions - Register sso handlers 2022-09-28 23:23:50,400 INFO [main] [] extensions - Load config properties 2022-09-28 23:23:50,409 INFO [main] [] extensions - Build Pac4J config 2022-09-28 23:23:50,412 FATAL [main] [] soap - Unable to start servlet java.lang.NoClassDefFoundError: org/springframework/core/io/Resource    at org.pac4j.config.builder.Saml2ClientBuilder.tryCreateSaml2Client(Saml2ClientBuilder.java:40) ~[pac4j-config-4.5.4.jar:?]    at org.pac4j.config.client.PropertiesConfigFactory.build(PropertiesConfigFactory.java:80) ~[pac4j-config-4.5.4.jar:?]    at com.iwayvietnam.zmsso.pac4j.ConfigBuilder.buildConfig(ConfigBuilder.java:139) ~[?:?]    at com.iwayvietnam.zmsso.pac4j.ConfigBuilder.<init>(ConfigBuilder.java:70) ~[?:?]    at com.iwayvietnam.zmsso.pac4j.ConfigBuilder.getInstance(ConfigBuilder.java:86) ~[?:?]    at com.iwayvietnam.zmsso.BaseSsoHandler.<init>(BaseSsoHandler.java:56) ~[?:?]    at com.iwayvietnam.zmsso.LoginHandler.<init>(LoginHandler.java:39) ~[?:?]    at com.iwayvietnam.zmsso.ZmSsoExtension.init(ZmSsoExtension.java:57) ~[?:?]

[Misagh]

Isn't the error here?

Caused by: java.lang.ClassNotFoundException:
org.springframework.core.io.Resource
at java.net.URLClassLoader.findClass(URLClassLoader.java:445) ~[?:?]
at java.lang.ClassLoader.loadClass(ClassLoader.java:587) ~[?:?]
at java.lang.ClassLoader.loadClass(ClassLoader.java:520) ~[?:?]

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[Jelle de Jong]

I have searched on that error, but the spring-core jar was present. What do you see about the error? What should I do?

# find -iname *spring*jar
./lib/jars/spring-beans-5.3.18.jar
./lib/jars/spring-aop-5.3.18.jar
./lib/jars/spring-context-5.3.18.jar
./lib/jars/spring-expression-5.3.18.jar
./lib/jars/spring-asm-3.0.7.RELEASE.jar
./lib/jars/spring-core-5.3.18.jar
./jetty_base/webapps/service/WEB-INF/lib/spring-beans-5.3.18.jar
./jetty_base/webapps/service/WEB-INF/lib/spring-aop-5.3.18.jar
./jetty_base/webapps/service/WEB-INF/lib/spring-context-5.3.18.jar
./jetty_base/webapps/service/WEB-INF/lib/spring-expression-5.3.18.jar
./jetty_base/webapps/service/WEB-INF/lib/spring-asm-3.0.7.RELEASE.jar
./jetty_base/webapps/service/WEB-INF/lib/spring-core-5.3.18.jar
./common/jetty_home/lib/spring/jetty-spring-9.4.46.v20220331.jar

[Misagh]

The JAR being present is one thing; the classloader loading it is
another. Your app, for whatever reason, is not loading that JAR for
you. You'll have to take it up with that app and the container and the
host environment.

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[Jelle de Jong]

Thank you!! I was able to get a good bit further debugging the dependencies.|

I now running into the following error and I am not sure how to move on.

I searched with google on "org.pac4j.saml.util.DefaultConfigurationManager Unable to get public no-arg constructor" but did not get much further is it an java version dependency issue?

2022-09-29 19:00:43,966 INFO  [main] [] extensions - Create sso session table
2022-09-29 19:00:43,971 INFO  [main] [] extensions - Register sso handlers
2022-09-29 19:00:43,975 INFO  [main] [] extensions - Load config properties
2022-09-29 19:00:43,984 INFO  [main] [] extensions - Build Pac4J config
2022-09-29 19:00:44,002 FATAL [main] [] soap - Unable to start servlet
java.util.ServiceConfigurationError: org.pac4j.saml.util.ConfigurationManager: org.pac4j.saml.util.DefaultConfigurationManager Unable to get public no-arg constructor
    at java.util.ServiceLoader.fail(ServiceLoader.java:586) ~[?:?]
    at java.util.ServiceLoader.getConstructor(ServiceLoader.java:679) ~[?:?]
    at java.util.ServiceLoader$LazyClassPathLookupIterator.hasNextService(ServiceLoader.java:1240) ~[?:?]
    at java.util.ServiceLoader$LazyClassPathLookupIterator.hasNext(ServiceLoader.java:1273) ~[?:?]
    at java.util.ServiceLoader$2.hasNext(ServiceLoader.java:1309) ~[?:?]
    at java.util.ServiceLoader$3.hasNext(ServiceLoader.java:1393) ~[?:?]
    at java.lang.Iterable.forEach(Iterable.java:74) ~[?:?]
    at org.pac4j.saml.util.Configuration.bootstrap(Configuration.java:76) ~[pac4j-saml-4.5.4.jar:?]
    at org.pac4j.saml.util.Configuration.<clinit>(Configuration.java:50) ~[pac4j-saml-4.5.4.jar:?]
    at org.pac4j.saml.client.SAML2Client.<clinit>(SAML2Client.java:88) ~[pac4j-saml-4.5.4.jar:?]
    at org.pac4j.config.builder.Saml2ClientBuilder.tryCreateSaml2Client(Saml2ClientBuilder.java:57) ~[pac4j-config-4.5.4.jar:?]

    at org.pac4j.config.client.PropertiesConfigFactory.build(PropertiesConfigFactory.java:80) ~[pac4j-config-4.5.4.jar:?]
    at com.iwayvietnam.zmsso.pac4j.ConfigBuilder.buildConfig(ConfigBuilder.java:139) ~[?:?]
    at com.iwayvietnam.zmsso.pac4j.ConfigBuilder.<init>(ConfigBuilder.java:70) ~[?:?]
    at com.iwayvietnam.zmsso.pac4j.ConfigBuilder.getInstance(ConfigBuilder.java:86) ~[?:?]
    at com.iwayvietnam.zmsso.BaseSsoHandler.<init>(BaseSsoHandler.java:56) ~[?:?]
    at com.iwayvietnam.zmsso.LoginHandler.<init>(LoginHandler.java:39) ~[?:?]
    at com.iwayvietnam.zmsso.ZmSsoExtension.init(ZmSsoExtension.java:57) ~[?:?]

[Misagh]

This looks like a problem now in pac4j, trying to load a class that
does not have the appropriate constructor:
https://github.com/pac4j/pac4j/blob/4.5.x/pac4j-saml/src/main/java/org/pac4j/saml/util/Configuration.java#L74

You probably need to fork the pac4j project and fix this issue on your
own, or upgrade.

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[Jelle de Jong]

Thank you for the hints and tips. I managed to get the code running and working with keycloak idp.

I updated the dependencies of the jar file by building with maven instead of ant jar and it started to work with the addition of a few extra jar files.