配置如下：

me.setJsonFactory(new FastJsonFactory());

Model 中定义方法

public List<MemberLoginBackground> getAll() {
    return find("select id,image from member_login_background where is_del='N' ");
}

使用JsonKit.toJson

List<MemberLoginBackground> rand = MemberLoginBackground.dao.getAll();
String bb = JsonKit.toJson(rand);

然后就卡死了，最终StackOverflowError

Caused by: java.lang.StackOverflowError

at com.alibaba.druid.sql.dialect.mysql.visitor.MySqlOutputVisitor.visit(MySqlOutputVisitor.java:639)

at com.alibaba.druid.sql.ast.expr.SQLCharExpr.accept0(SQLCharExpr.java:43)

at com.alibaba.druid.sql.ast.SQLObjectImpl.accept(SQLObjectImpl.java:41)

at com.alibaba.druid.sql.visitor.SQLASTOutputVisitor.visitorBinaryRight(SQLASTOutputVisitor.java:435)

at com.alibaba.druid.sql.visitor.SQLASTOutputVisitor.visit(SQLASTOutputVisitor.java:396)

at com.alibaba.druid.sql.ast.expr.SQLBinaryOpExpr.accept0(SQLBinaryOpExpr.java:98)

at com.alibaba.druid.sql.ast.SQLObjectImpl.accept(SQLObjectImpl.java:41)

at com.alibaba.druid.sql.dialect.mysql.visitor.MySqlOutputVisitor.visit(MySqlOutputVisitor.java:277)

at com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlSelectQueryBlock.accept0(MySqlSelectQueryBlock.java:219)

at com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlSelectQueryBlock.accept0(MySqlSelectQueryBlock.java:210)

at com.alibaba.druid.sql.ast.SQLObjectImpl.accept(SQLObjectImpl.java:41)

at com.alibaba.druid.sql.visitor.SQLASTOutputVisitor.visit(SQLASTOutputVisitor.java:1033)

at com.alibaba.druid.sql.ast.statement.SQLSelect.accept0(SQLSelect.java:87)

at com.alibaba.druid.sql.ast.SQLObjectImpl.accept(SQLObjectImpl.java:41)

at com.alibaba.druid.sql.visitor.SQLASTOutputVisitor.visit(SQLASTOutputVisitor.java:1279)

at com.alibaba.druid.sql.ast.statement.SQLSelectStatement.accept0(SQLSelectStatement.java:63)

at com.alibaba.druid.sql.ast.SQLObjectImpl.accept(SQLObjectImpl.java:41)

at com.alibaba.druid.sql.visitor.ParameterizedOutputVisitorUtils.parameterize(ParameterizedOutputVisitorUtils.java:66)

at com.alibaba.druid.wall.WallProvider.getWhiteSql(WallProvider.java:463)

at com.alibaba.druid.wall.WallProvider.checkWhiteAndBlackList(WallProvider.java:730)

at com.alibaba.druid.wall.WallProvider.checkInternal(WallProvider.java:596)

at com.alibaba.druid.wall.WallProvider.check(WallProvider.java:574)

at com.alibaba.druid.wall.WallFilter.check(WallFilter.java:712)

at com.alibaba.druid.wall.WallFilter.connection_prepareStatement(WallFilter.java:253)

at com.alibaba.druid.filter.FilterChainImpl.connection_prepareStatement(FilterChainImpl.java:448)

at com.alibaba.druid.filter.FilterAdapter.connection_prepareStatement(FilterAdapter.java:928)

at com.alibaba.druid.filter.FilterEventAdapter.connection_prepareStatement(FilterEventAdapter.java:122)

at com.alibaba.druid.filter.FilterChainImpl.connection_prepareStatement(FilterChainImpl.java:448)

at com.alibaba.druid.proxy.jdbc.ConnectionProxyImpl.prepareStatement(ConnectionProxyImpl.java:342)

at com.alibaba.druid.pool.DruidPooledConnection.prepareStatement(DruidPooledConnection.java:346)

at com.jfinal.plugin.activerecord.Model.find(Model.java:641)

at com.jfinal.plugin.activerecord.Model.find(Model.java:660)

at com.jfinal.plugin.activerecord.Model.find(Model.java:672)

at com.ibdyr.model.system.MemberLoginBackground.getAll(MemberLoginBackground.java:18)

at com.alibaba.fastjson.serializer.ASMSerializer_1_MemberLoginBackground.write(Unknown Source)

at com.alibaba.fastjson.serializer.ASMSerializer_1_MemberLoginBackground.write(Unknown Source)

at com.alibaba.fastjson.serializer.ASMSerializer_1_MemberLoginBackground.write(Unknown Source)

at com.alibaba.fastjson.serializer.ASMSerializer_1_MemberLoginBackground.write(Unknown Source)

at com.alibaba.fastjson.serializer.ASMSerializer_1_MemberLoginBackground.write(Unknown Source)

at com.alibaba.fastjson.serializer.ASMSerializer_1_MemberLoginBackground.write(Unknown Source)

at com.alibaba.fastjson.serializer.ASMSerializer_1_MemberLoginBackground.write(Unknown Source)

at com.alibaba.fastjson.serializer.ASMSerializer_1_MemberLoginBackground.write(Unknown Source)

at com.alibaba.fastjson.serializer.ASMSerializer_1_MemberLoginBackground.write(Unknown Source)

at com.alibaba.fastjson.serializer.ASMSerializer_1_MemberLoginBackground.write(Unknown Source)

at com.alibaba.fastjson.serializer.ASMSerializer_1_MemberLoginBackground.write(Unknown Source)

at com.alibaba.fastjson.serializer.ASMSerializer_1_MemberLoginBackground.write(Unknown Source)

at com.alibaba.fastjson.serializer.ASMSerializer_1_MemberLoginBackground.write(Unknown Source)

at com.alibaba.fastjson.serializer.ASMSerializer_1_MemberLoginBackground.write(Unknown Source)

at com.alibaba.fastjson.serializer.ASMSerializer_1_MemberLoginBackground.write(Unknown Source)

at com.alibaba.fastjson.serializer.ASMSerializer_1_MemberLoginBackground.write(Unknown Source)