从库中读取100条左右的记录时就开始报错,该如何解决

从库中读取100条左右的记录时就开始报错
java.lang.OutOfMemoryError: Java heap space
at java.util.Arrays.copyOf(Arrays.java:2882)
at java.lang.AbstractStringBuilder.expandCapacity(AbstractStringBuilder.java:100)
at java.lang.AbstractStringBuilder.append(AbstractStringBuilder.java:390)
at java.lang.StringBuilder.append(StringBuilder.java:119)
at java.lang.StringBuilder.append(StringBuilder.java:115)
at org.apache.struts2.json.JSONWriter.add(JSONWriter.java:504)
at org.apache.struts2.json.JSONWriter.add(JSONWriter.java:327)
at org.apache.struts2.json.JSONWriter.bean(JSONWriter.java:228)
at org.apache.struts2.json.JSONWriter.process(JSONWriter.java:165)
at org.apache.struts2.json.JSONWriter.value(JSONWriter.java:131)
at org.apache.struts2.json.JSONWriter.array(JSONWriter.java:418)
at org.apache.struts2.json.JSONWriter.process(JSONWriter.java:155)
at org.apache.struts2.json.JSONWriter.value(JSONWriter.java:131)
at org.apache.struts2.json.JSONWriter.add(JSONWriter.java:329)
at org.apache.struts2.json.JSONWriter.bean(JSONWriter.java:228)
at org.apache.struts2.json.JSONWriter.process(JSONWriter.java:165)
at org.apache.struts2.json.JSONWriter.value(JSONWriter.java:131)
at org.apache.struts2.json.JSONWriter.add(JSONWriter.java:329)
at org.apache.struts2.json.JSONWriter.bean(JSONWriter.java:228)
at org.apache.struts2.json.JSONWriter.process(JSONWriter.java:165)
at org.apache.struts2.json.JSONWriter.value(JSONWriter.java:131)
at org.apache.struts2.json.JSONWriter.add(JSONWriter.java:329)
at org.apache.struts2.json.JSONWriter.bean(JSONWriter.java:228)
at org.apache.struts2.json.JSONWriter.process(JSONWriter.java:165)
at org.apache.struts2.json.JSONWriter.value(JSONWriter.java:131)
at org.apache.struts2.json.JSONWriter.add(JSONWriter.java:329)
at org.apache.struts2.json.JSONWriter.bean(JSONWriter.java:228)
at org.apache.struts2.json.JSONWriter.process(JSONWriter.java:165)
at org.apache.struts2.json.JSONWriter.value(JSONWriter.java:131)
at org.apache.struts2.json.JSONWriter.add(JSONWriter.java:329)
at org.apache.struts2.json.JSONWriter.bean(JSONWriter.java:228)
at org.apache.struts2.json.JSONWriter.process(JSONWriter.java:165)
求高人指点


------解决方案--------------------

Java code

at java.util.Arrays.copyOf(Arrays.java:2882)

------解决方案--------------------

可能你操作数据库那些Connection、结果集这些东西都没有关闭造成的。