小编kpa*_*r87的帖子

我正在使用版本2.5.1中的GWT开发应用程序.

几天前我们在日志中发现有大量的异常(每秒几个!!!),如下所示:

Nov 5, 2014 6:00:45 PM com.google.gwt.logging.server.RemoteLoggingServiceUtil logOnServer
SEVERE: (NS_ERROR_NOT_INITIALIZED) : 
com.google.gwt.core.client.impl.SerializableThrowable$ThrowableWithClassName: (NS_ERROR_NOT_INITIALIZED) : 
 at Unknown.ZHe(StackTraceCreator.java:174)
 at Unknown.WFe(StackTraceCreator.java:508)
 at Unknown.IHf(Exceptions.java:29)
 at Unknown.pIb(XMLHttpRequest.java:164)
 at Unknown.OMe(RequestBuilder.java:411)
 at Unknown.anonymous(XMLHttpRequest.java:351)
 at Unknown.gHe(Impl.java:189)
 at Unknown.jHe(Impl.java:243)
 at Unknown.anonymous(Impl.java:70)

至少在两种情况下,从Mozilla Firefox Web浏览器使用应用程序时发生问题.要阻止它,仅关闭浏览器是不够的,还要从任务管理器中终止进程.但我不确定它是否也不会被其他浏览器触发.

我还在com.google.gwt.http.client.Request类中找到了这条评论,方法为cancel():

/*
 * There is a strange race condition that occurs on Mozilla when you cancel
 * a request while the response is coming in. It appears that in some cases
 * the onreadystatechange handler is still called after the handler function
 * has …

如何覆盖grails域类中one-to-many关系字段的getter和setter？我知道如何覆盖作为单个对象的字段的getter和setter,但是我对Collections有问题.这是我的情况:

我有Entity域类,它有很多标题.现在我想覆盖标题的getter,只获得标志为isActive equals true的标题.我尝试过类似的东西,但它不起作用:

class Entity {

    static hasMany = [
        titles: Title
    ]

    public Set<Title> getTitles() {
        if(titles == null)
            return null
        return titles.findAll { r -> r.isActive == true }
    }

    public void setTitles(Set<Title> s) {
        titles = s
    }
}

class Title {
    Boolean isActive

    static belongsTo = [entity:Entity]

    static mapping = {
        isActive column: 'is_active'
        isActive type: 'yes_no'
    }
}

谢谢您的帮助.

我有以下 JSON：

{
      "id" : "1",
      "birthday" : 401280850089
}

和 POJO 类：

public class FbProfile {
    long id;
    @JsonDeserialize(using = LocalDateDeserializer.class)
    LocalDate birthday;
}

我正在使用 Jackson 进行反序列化：

public FbProfile loadFbProfile(File file) throws JsonParseException, JsonMappingException, IOException {
    ObjectMapper mapper = new ObjectMapper();
    FbProfile profile = mapper.readValue(file, FbProfile.class);
    return profile;
}

但它抛出一个异常：

com.fasterxml.jackson.databind.JsonMappingException：意外的令牌（VALUE_NUMBER_INT），预期的 VALUE_STRING：预期的数组或字符串。

我怎样才能反序列化纪元LocalDate？我想补充一点，如果我将数据类型从更改LocalDate为java.util.Date它，它工作得很好。因此，也许最好反序列化java.util.Date并创建 getter 和 setter 来进行 to/from 的转换LocalDate。

使用JdbcTemplate，我想调用MERGE SQL语句，该语句将向表中插入新记录，或者如果已经存在具有特定键的行，则更新该语句。关键部分是该列之一是Oracle BLOB类型。

这是我到目前为止尝试过的：

尝试1。

SQL语句：

    String sql = ""
            + "MERGE INTO file_thumbnails "
            + "     USING (SELECT ? as file_c_id, ? as thumbnail_type, ? as thumbnail_image FROM DUAL) tmp "
            + "        ON (file_thumbnails.file_c_id = tmp.file_c_id AND "
            + "            file_thumbnails.thumbnail_type = tmp.thumbnail_type) "
            + "      WHEN MATCHED THEN "
            + "        UPDATE "
            + "           SET thumbnail_image = tmp.thumbnail_image "
            + "              ,thumbnail_date = SYSDATE "
            + "      WHEN NOT MATCHED THEN "
            + "        INSERT (c_id, …