上下文数据源设置不会被拾取

Context datasource settings don't get picked up

目标
我正在创建一个 REST web 服务(使用 RESTEasy),我认为如果我不管理连接池会很好,但我让 Tomcat 这样做。所以我在 META-INF/context.xml

中添加了一个资源

问题
我看到在 MySQL 服务器上建立了很多连接,但我已经配置了总共只允许 2 个连接。我不知道为什么,但我的设置没有获取有关连接数等的信息。

Context.xml

<Context>
    <!-- DataSource management from tomcat (reference created in web.xml) -->
    <Resource name="jdbc/Taalmaatjes-db" auth="Container" type="javax.sql.DataSource"
              maxTotal="2" maxIdle="2"
              initialSize="1" maxWaitMillis="10000"
              username="root" password="rootie"
              driverClassName="com.mysql.jdbc.Driver" 
              url="jdbc:mysql://localhost:3306/taalmaatjes"
              removeAbandonedOnBorrow="true" 
              removeAbandonedOnMaintenance="true"
              removeAbandonedTimeout="5"
              singleton="false" defaultAutoCommit="false" rollbackOnReturn="true" />
</Context>

设置 maxTotal、maxIdle、initialSize、maxWaitMillis 似乎没有被拾取。使用 commando 'SHOW PROCESSLIST' 并连接到我的应用程序 39 次,我得到:

3   root    localhost:56576 taalmaatjes Query   0   starting    /* ApplicationName=IntelliJ IDEA 2017.3.4 */ SHOW PROCESSLIST
231 root    localhost:57932 taalmaatjes Sleep   102     
232 root    localhost:57933 taalmaatjes Sleep   102     
233 root    localhost:57934 taalmaatjes Sleep   100     
234 root    localhost:57935 taalmaatjes Sleep   99      
235 root    localhost:57936 taalmaatjes Sleep   99      
236 root    localhost:57937 taalmaatjes Sleep   99      
237 root    localhost:57938 taalmaatjes Sleep   99      
238 root    localhost:57939 taalmaatjes Sleep   98      
239 root    localhost:57940 taalmaatjes Sleep   98      
240 root    localhost:57941 taalmaatjes Sleep   98      
241 root    localhost:57942 taalmaatjes Sleep   98      
242 root    localhost:57943 taalmaatjes Sleep   98      
243 root    localhost:57944 taalmaatjes Sleep   98      
244 root    localhost:57945 taalmaatjes Sleep   97      
245 root    localhost:57950 taalmaatjes Sleep   93      
246 root    localhost:57951 taalmaatjes Sleep   93      
247 root    localhost:57952 taalmaatjes Sleep   93      
248 root    localhost:57953 taalmaatjes Sleep   92      
249 root    localhost:57954 taalmaatjes Sleep   92      
250 root    localhost:57955 taalmaatjes Sleep   92      
251 root    localhost:57956 taalmaatjes Sleep   92      
252 root    localhost:57957 taalmaatjes Sleep   92      
253 root    localhost:57958 taalmaatjes Sleep   92      
254 root    localhost:57959 taalmaatjes Sleep   92      
255 root    localhost:57960 taalmaatjes Sleep   92      
256 root    localhost:57961 taalmaatjes Sleep   91      
257 root    localhost:57962 taalmaatjes Sleep   91      
258 root    localhost:57963 taalmaatjes Sleep   91      
259 root    localhost:57964 taalmaatjes Sleep   91      
260 root    localhost:57965 taalmaatjes Sleep   91      
261 root    localhost:57966 taalmaatjes Sleep   91      
262 root    localhost:57967 taalmaatjes Sleep   91      
263 root    localhost:57968 taalmaatjes Sleep   91      
264 root    localhost:57969 taalmaatjes Sleep   90      
265 root    localhost:57970 taalmaatjes Sleep   90      
266 root    localhost:57971 taalmaatjes Sleep   90      
267 root    localhost:57972 taalmaatjes Sleep   90      
268 root    localhost:57974 taalmaatjes Sleep   90      
269 root    localhost:57975 taalmaatjes Sleep   90      

在代码中调用获取DataSource

这里有一个例子,它放在我可以调用的方法中:

@GET
public StringValueObject getVersion() throws NamingException, SQLException {
    DataSource dataSource1 = (DataSource) ((javax.naming.Context) new InitialContext()
            .lookup("java:comp/env"))
            .lookup("jdbc/Taalmaatjes-db");
    dataSource1.getConnection().close();
    return new StringValueObject("v0.1-unsecured");
}

请注意,在调用此 getVersion 20 次后,我仍有 20 个连接显示在 SHOW PROCESSLIST 中。

可能有用的详细信息
我使用 jOOQ 作为我的 ORM 和 MySQL 数据库。它在 tomcat 上运行。 我还尝试添加 factory="org.apache.tomcat.jdbc.pool.DataSourceFactory",因为 中提到了这一点。但是,它也没有用。

我的知识
我对这个 JBNI 真的很陌生,JDBC 东西。我知道的太少,这就是我来这里学习的原因!我以为我使用的是 Tomcat JBNI,但是当我使用设置 removeAbandoned="true" 时,它给出了错误,该设置不存在,我应该使用 removeAbandonedOnBorrow。显然我正在使用 Apache JBDC?真的不知道区别,因为我只是想让 tomcat 来处理我的连接池。把它留给另一个图书馆似乎很聪明。

问题是您已将数据源资源配置为非单例,此处:

<Resource name="jdbc/Taalmaatjes-db" auth="Container" type="javax.sql.DataSource"
    maxTotal="2" maxIdle="2"
    initialSize="1" maxWaitMillis="10000"
    username="root" password="rootie"
    driverClassName="com.mysql.jdbc.Driver" 
    url="jdbc:mysql://localhost:3306/taalmaatjes"
    removeAbandonedOnBorrow="true" 
    removeAbandonedOnMaintenance="true"
    removeAbandonedTimeout="5"
    <!-- here -->
    singleton="false" defaultAutoCommit="false" rollbackOnReturn="true" />

删除它并重试。