异常的org.hibernate.LazyInitializationException: could not initialize proxy

昨天总是抛出这个异常，想想最简单的方法估计就是把fetch设置为FetchType.EAGER，可这未免也太影响了效率，在网上上尝试了几种方法人们都建议把fetch 设为 FetchType.EAGER，或者通过在web.xml中设置OpenSessionInViewFilter，结果都不凑效，在同事的指导下发现用fetch可以解决这一难题。这就是fetch的功能。我们可以把fetch与lazy="true"的关系类比为事务当中的编程式事务与声明式事务。
错误的hql语句

SELECT bioChemicalInfo FROM BioChemicalInfo AS bioChemicalInfo LEFT JOIN bioChemicalInfo.experiment AS experiment LEFT JOIN experiment.experimentProcesses experimentProcess LEFT JOIN experimentProcess.experimentProcessRecords

加入fetch以后

SELECT bioChemicalInfo FROM BioChemicalInfo AS bioChemicalInfo LEFT JOIN [color=blue]FETCH [/color]bioChemicalInfo.experiment AS experiment LEFT JOIN FETCH experiment.experimentProcesses experimentProcess LEFT JOIN FETCH experimentProcess.experimentProcessRecords