[Wrapper-user] Unable to access embedded jars in a Spring Boot executable.

[Milind R. <mi...@gm...>]

I'm using Spring Boot to create an executable jar with an embedded 
Tomcat container.

This is the relevant information from the MANIFEST.MF file

    Spring-Boot-Version: 2.0.5.RELEASE
    Main-Class: org.springframework.boot.loader.JarLauncher
    Start-Class: com.example.PaymentBridge
    Spring-Boot-Classes: BOOT-INF/classes/
    Spring-Boot-Lib: BOOT-INF/lib/
    Created-By: Apache Maven 3.0.5
    Build-Jdk: 1.8.0_191

I can run the jar file on Linux with no problem.
  java -jar example.jar

I used method 4 to wrap the jar file and when I run it, I get an error

    Caused by: java.lang.RuntimeException: XPathFactory#newInstance()
    failed to create an XPathFactory for the default object model:
    http://java.sun.com/jaxp/xpath/dom with the
    XPathFactoryConfigurationException:
    javax.xml.xpath.XPathFactoryConfigurationException:
    java.util.ServiceConfigurationError: javax.xml.xpath.XPathFactory:
    Provider com.saxonica.config.EnterpriseXPathFactory could not be
    instantiated

This is because it couldn't find the Saxon-EE-9.5.1.9.jar file which is 
in the BOOT-INF/lib/ directory of the spring boot jar file.

I pulled out all the jars in the BOOT-INF/lib directory and copied them 
to a directory that I added to a lib2 directory to test.  Added the 
following property to the wrapper.conf file
     wrapper.java.classpath.2=../lib2/*.jar
and it worked.

Clearly I don't want to do that with every file in the first place. And 
I don't want to have to keep doing that every time my dependencies change.

How can I get the wrapper to add all the embedded jars to the classpath?

On startup, I do see this line.

    Application started with classpath:
    [jar:file:/opt/example/0.1.0/bin/../lib/example-bridge-0.1.0-SNAPSHOT.jar!/BOOT-INF/classes!/,
    jar:file:/opt/example/0.1.0/bin/../lib/example-bridge-0.1.0-SNAPSHOT.jar!/BOOT-INF/lib/spring-boot-starter-web-2.0.5.RELEASE.jar!/,
    jar:file:/opt/example/0.1.0/bin/../lib/example-bridge-0.1.0-SNAPSHOT.jar!/BOOT-INF/lib/spring-boot-starter-2.0.5.RELEASE.jar!/,

    ...
    ,
    jar:file:/opt/example/0.1.0/bin/../lib/example-bridge-0.1.0-SNAPSHOT.jar!/BOOT-INF/lib/*Saxon-EE-9.5.1.9.jar!*/,
    jar:file:/opt/example/0.1.0/bin/../lib/example-bridge-0.1.0-SNAPSHOT.jar!/BOOT-INF/lib/xercesImpl-2.10.0.jar!

On linux the classpath is separated by ':', I'm not sure if the comma 
between the jars is causing a problem or what.

Any help would be appreciated.