can not get javaBeanDeserializer. java.time.LocalDateTime

这个错误通常是因为缺少对应的 JavaBeanDeserializer 序列化器导致的。这个问题通常出现在使用 Jackson 序列化和反序列化 LocalDateTime 类型的时候。

解决这个问题的方法是在你的项目中引入对应的 Jackson-datatype-jsr310 依赖。这个依赖包含了对 Java 8 时间日期 API 的支持，可以让 Jackson 正确地序列化和反序列化 LocalDateTime 类型。

如果你使用的是 Maven，可以在你的 pom.xml 文件中添加以下依赖：

<dependency>
    <groupId>com.fasterxml.jackson.datatype</groupId>
    <artifactId>jackson-datatype-jsr310</artifactId>
    <version>2.13.0</version>
</dependency>

如果你使用的是 Gradle，可以在你的 build.gradle 文件中添加以下依赖：

implementation 'com.fasterxml.jackson.datatype:jackson-datatype-jsr310:2.13.0'

添加完依赖后，重新构建你的项目即可解决这个问题。

相关问题

can not get javaBeanDeserializer

The error message "can not get javaBeanDeserializer" typically occurs when there is a problem with deserializing a JSON object to a Java object. This can happen when the JSON object does not match the expected structure of the Java object, or when there is an issue with the library used for deserialization.

To troubleshoot this issue, you can try the following:

1. Check the JSON object to ensure that it matches the expected structure of the Java object. Make sure that all the required fields are present and that their data types match.

2. Check the library used for deserialization. Make sure that it is compatible with your Java version and that it is correctly configured. Some libraries require custom configuration to handle specific data types or structures.

3. If you are using a custom Java object, make sure that it is correctly defined and annotated with the appropriate annotations for the library used for deserialization.

4. Check the stack trace for more detailed information about the error. This may give you a better idea of where the problem is occurring and how to fix it.

将上面一段的代码进行java.time.LocalDateTime和java.sql.Timestamp类型转换

下面是将上述代码中的`java.sql.Timestamp`类型转换为`java.time.LocalDateTime`类型的示例代码：

java.sql.Timestamp timestamp = (java.sql.Timestamp) main.get("main_creatime"); // 数据库时间戳
LocalDateTime localDateTime = timestamp.toLocalDateTime(); // 转换为LocalDateTime对象

而将`java.time.LocalDateTime`类型转换为`java.sql.Timestamp`类型的示例代码如下：

LocalDateTime localDateTime = LocalDateTime.now(); // 获取当前时间
java.sql.Timestamp timestamp = java.sql.Timestamp.valueOf(localDateTime); // 转换为Timestamp对象

请注意，在进行类型转换时，需要确保数据库中存储的时间戳格式与`java.time.LocalDateTime`对象的格式一致，以便正确进行转换。