Thread-safe problem while inserting(java.sql.SQLException: SQL String cannot be NULL )

[gamtruliar]

java.sql.SQLException: SQL String cannot be NULL

In StandardSqlMaker getPojoInfo:
private static ConcurrentHashMap<Class<?>, StandardPojoInfo> map = new ConcurrentHashMap<>();

public StandardPojoInfo getPojoInfo(Class<?> rowClass) {
	StandardPojoInfo pi = map.get(rowClass);
	if (pi == null) {
		pi = new StandardPojoInfo(rowClass);
		map.put(rowClass, pi);

		makeInsertSql(pi);
		makeUpsertSql(pi);
		makeUpdateSql(pi);
		makeSelectColumns(pi);
	}
	return pi;
}

There is some case that sql is not generated before using,
when doing many inserts in many threads at the first time.

When B thread get a StandardPojoInfo just after A thread finished the row of "map.put(rowClass, pi);"
B will get a StandardPojoInfo with null sql and then cause a exception.

It seem to need a lock for it. :)

[ccleve]

Yup, I can see how this can happen. I just added a "synchronized" keyword to the method and pushed it to master. Version bumped to 1.0.6. Can you test it to see if it fixes the problem?

[ccleve]

@gamtruliar Did the change fix your problem?