Slow compilation with jOOQ 3.6+, plain SQL, and the javac compiler [duplicate]

Answer 1

Explanation

In jOOQ 3.6 (when this problem first appears), the DSL.field() API saw 22 new overloads taking different Row types as arguments:

• DSL.field(Row1<T1>)
• DSL.field(Row2<T1, T2>)
• DSL.field(Row3<T1, T2, T3>)
• ...

It appears that with this particular API usage above, the new overloads cause a lot of trouble when the javac compiler tries to find the most specific overload among all the possible overloads. The following workaround compiles instantly:

Fix

A fix is under way for releases 3.9.0, 3.8.1, 3.7.4, 3.6.5, removing these methods again from the public API, and providing a renamed substitute that does not cause any overloading issues.

Workarounds

1. Helping the compiler select the most specific DSL.field() overload

import static org.jooq.impl.DSL.field;

import org.jooq.Field;
import org.jooq.SQLDialect;
import org.jooq.impl.DSL;

public class Test {
    public void method() {
        Field<Object> f1 = field("client.id");
        Field<Object> f2 = field("client_id");
        DSL.using(SQLDialect.MYSQL)
           .select()
           .where(DSL.trueCondition())
           .and(f1.eq(f2))
           .and(f1.eq(f2))
           .and(f1.eq(f2))
           .and(f1.eq(f2))
           .and(f1.eq(f2))
           .and(f1.eq(f2))
           .and(f1.eq(f2))
           .and(f1.eq(f2))
           .and(f1.eq(f2))
           .and(f1.eq(f2))
        ;
    }
}

2. Preventing target type inference in the context of the and() method entirely

import static org.jooq.impl.DSL.field;

import org.jooq.Condition;
import org.jooq.SQLDialect;
import org.jooq.impl.DSL;

public class Test {
    public void method() {
        Condition condition = field("client.id").eq(field("client_id"));
        DSL.using(SQLDialect.MYSQL)
           .select()
           .where(DSL.trueCondition())
           .and(condition)
           .and(condition)
           .and(condition)
           .and(condition)
           .and(condition)
           .and(condition)
           .and(condition)
           .and(condition)
           .and(condition)
           .and(condition)
        ;
    }
}

More info

This has actually been reported on Stack Overflow before:

• Troubleshoot slow compilation
• http://bugs.java.com/bugdatabase/view_bug.do?bug_id=8086048

And it has been discussed also on the jOOQ user group:

• https://groups.google.com/forum/#!topic/jooq-user/vuaG9d9krDk
• https://groups.google.com/forum/#!topic/jooq-user/grv6Wu_sFtA