Assuming each jar had a @Singleton the visibility/scope rules would be as follows:

EAR:

• Red Singleton can see the Blue Singleton and vice versa
• Red or Blue Singleton cannot see the Pink, Purple, Orange or Yellow

WebappA

• Pink Singleton can see the Purple Singleton and vice versa
• Pink and Purple Singletons can see the Red and Blue Singletons
• Pink and Purple Singletons cannot see the Orange or Yellow Singletons

WebappB

• Orange Singleton can see the Yellow Singleton and vice versa
• Orange and Yellow Singletons can see the Red and Blue Singletons
• Orange or Yellow Singletons cannot see the Pink or Purple Singletons