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由于对象没有没有new出来直接使用，提示该错误


private List<AuthInfo> authInfoList;

/*此处必须new粗来*/
authInfoList = new ArrayList<AuthInfo>();

AuthInfo authInfo = new AuthInfo();

authInfo.setGateName(gate.getName());

authInfo.setType(authorizations.get(i).getType());
authInfo.setTeam(authorizations.get(i).getTeam());
authInfo.setWeek(authorizations.get(i).getWeek());
authInfo.setStartTime(authorizations.get(i).getStartTime());
authInfo.setEndTime(authorizations.get(i).getEndTime());

authInfoList.add(authInfo);


@XmlRootElement(name="commandlist")
@XmlAccessorType(XmlAccessType.FIELD)
public class CommandList {
    @XmlElement(name="command")
    private List<Command> commandList;

    public List<Command> getCommandList(){return commandList;}
    public void setCommandList(List<Command> commandList){
        this.commandList = commandList;
    }
}

CommandList commandList = new CommandList();commandList.setCommandList(new ArrayList<Command>()); //必须加，否则空指针

for(int i=0; i<delIoBean.getGateNameList().size(); i++){
    Command command = new Command();
    command.setCmd("delIo");
    command.setGate(delIoBean.getGateNameList().get(i));
    command.setData("");

    commandList.getCommandList().add(command);
}


本文标签： 错误JavalangNullPointerException

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