[英]How to fix org.codehaus.jackson.map.exc.UnrecognizedPropertyException
[英]How to resolve exception org.codehaus.jackson.map.exc.UnrecognizedPropertyException
请将json字符串转换为java用户定义的对象时,请帮助我以下异常。
org.codehaus.jackson.map.exc.UnrecognizedPropertyException: Unrecognized field "acknowledgedby" (Class com.xchange.model.XchangeOutboundMessage), not marked as ignorable
at [Source: java.io.StringReader@3452296e; line: 1, column: 34] (through reference chain: com.xchange.model.XchangeOutboundMessage["acknowledgedby"])
我还在stackoverflow上发现了很多链接,所有建议在模型字段上使用@JsonIgnore注释,但我不能忽略这一点。
public List getOutBoundMessageList(){
List list=new ArrayList();
ObjectMapper mapper = new ObjectMapper();
XchangeOutboundMessage xchangeOutboundMessage=null;
String json1=null;
try {
cluster = Cluster.builder().addContactPoint(contactPoints).build();
session = cluster.connect(keySpaceName);
cassandraOps = new CassandraTemplate(session);
String queryString="Select JSON * from XchangeOutboundMessage";
ResultSet result = session.execute(queryString);
int i=0;
String json1=null;
for(Row row:result) {
json1 = row.getString(i);
xchangeOutboundMessage = mapper.readValue(json1, XchangeOutboundMessage.class);
list.add(xchangeOutboundMessage);
i++;
}
} catch (Exception e) {
e.printStackTrace();
}
return list;
}
}
模型类字段和getter,setter发生异常的地方
private String acknowledgedBy;
public String getAcknowledgedBy() {
return acknowledgedBy;
}
public void setAcknowledgedBy(String acknowledgedBy) {
this.acknowledgedBy = acknowledgedBy;
}
由于Jacks映射器区分大小写,您将获得异常。 默认情况下,cassandra使每个列名称为tolowercase。 这就是为什么你的字段名称(acknowredgedBy)和cassandra cassandra的列名(acknowgedby)不匹配的原因。
您可以通过configure方法设置jackson映射器以匹配不区分大小写的密钥。
mapper.configure(MapperFeature.ACCEPT_CASE_INSENSITIVE_PROPERTIES, true);
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