Bug#941685: libspring-java: FTBFS package org.hibernate.validator.method does not exist

[Ryan Tandy]

I tested the affected classes (MethodValidationInterceptor and 
LocalValidatorFactoryBean) briefly and both appear to work correctly 
using libhibernate-validator-java 5.3.6-1, so I opened the MR now:

https://salsa.debian.org/java-team/libspring-java/merge_requests/2

As noted in #942507, h-v 5 does require an Expression Language (EL) impl 
at runtime. For my tiny test case I used libtomcat9-embed-el and it 
worked, but I am not sure if it's really valid to use that outside a 
Tomcat container. It sounds like org.glassfish:el-impl is another 
popular choice but it is not packaged. Again this looks like something 
that has to be decided by each application (for example with webapps the 
EL impl may be provided by the container e.g. Tomcat).