core/src/main/java/org/springframework/security/access/expression/method/ExpressionBasedAnnotationAttributeFactory.java
private ExpressionParser getParser() {
		if (this.parser != null) {
			return this.parser;
		}
		synchronized (parserLock) {
			this.parser = handler.getExpressionParser();
			this.handler = null;
		}
		return this.parser;
	}
private ExpressionParser getParser() {
		if (this.parser != null) {
			return this.parser;
		}
		synchronized (parserLock) {
			this.parser = handler.getExpressionParser();
			this.handler = null;
		}
		return this.parser;
	}
private ExpressionParser getParser ( ) { if ( this . parser != null ) { return this . parser ; } synchronized ( parserLock ) { this . parser = handler . getExpressionParser ( ) ; this . handler = null ; } return this . parser ; }
Delay the lookup of the {@link ExpressionParser} to prevent SEC-2136

@return
Delay the lookup of the { @link ExpressionParser } to prevent SEC - 2136