用于处理列表的JavaAPI

我正在对对象列表进行大量处理和搜索。渲染结果时，我的应用程序内存不足。是否有任何API可以有效地处理/处理对象列表，我正在尝试对其进行优化

还有一件事我想说，我正在用新的ArrayList初始化我的所有列表。我应该用别的东西吗

我有一个屏幕，需要显示记录并搜索这些记录，我使用的是那里的API（这是我唯一的方法，因为我无法访问他们的数据库，也无法运行SQL查询）。屏幕上显示的每个记录都会搜索特定条件，我使用他们的搜索API进行搜索。我正在调试代码，发现该搜索方法引发了异常。我正在粘贴错误日志

Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.0.2.v20100323-r6872): org.eclipse.persistence.exceptions.DatabaseException
Internal Exception: java.sql.SQLException: [OWLS][SQLServer JDBC Driver][SQLServer]There is insufficient system memory in resource pool 'internal' to run this query.
Error Code: 701
Call: SELECT DISTINCT t0.PRIMARY_KEY, t0.TOTAL_ACCRUAL, t0.TOTAL_ALLOCATED, t0.ALLOC_LIMIT, t0.APPL_END_ON, t0.APPL_EXPENSE_PERCENT, t0.APPL_NON_US_TAX_PERCENT, t0.APPL_INVD_EXPENSE_PERCENT, t0.APPL_INVD_TASK_PERCENT, t0.APPL_START_ON, t0.APPL_TASK_PERCENT, t0.INVOLVED_APPL_TYPE_IID, t0.PROJECT_APPL_TYPE_IID, t0.VENDOR_APPL_TYPE_IID, t0.TOTAL_BG_AVAILABLE, t0.CREATED_ON, t0.STATUS_IID, t0.APPL_EXPENSE, t0.APPL_INVC_ACCRUAL, t0.APPL_INVC_CREDIT_NOTE, t0.APPL_NON_US_TAX, t0.APPL_INVC_SHADOW, t0.APPL_INVC_STANDARD, t0.APPL_INVD_EXPENSE, t0.APPL_INVD_TASK, t0.APPL_TASK, t0.AUTO_POST, t0.MODIFIED_ON, t0.NAME, t0.OVERDRAFT_TYPE_IID, t0.POSTED_TYPE_IID, t0.SECURITY_TYPE_IID, t0.TREE_KEY, t0.TYPE_IID, t0.TOTAL_USED, t0.VERSION, t0.APPL_EXPENSE_CATEGORY_ID, t0.APPL_NON_US_TAX_TYPE, t0.APPL_INVOLVED_ID, t0.APPL_INVD_EXP_CATEGORY_ID, t0.APPL_INVD_TASK_CATEGORY_ID, t0.APPL_PROJECT_CATEGORY_ID, t0.APPL_PROJ_DETAIL_FIELD_ID, t0.PROJECT_ID, t0.APPL_TASK_CATEGORY_ID, t0.APPL_VENDOR_ID, t0.APPROVAL_STATUS_ID, t0.CREATED_BY_ID, t0.CREATED_ON_BEHALF_OF_ID, t0.DEFAULT_CATEGORY_ID, t0.DOCUMENT_FOLDER_ID, t0.FORUM_ID, t0.MODIFIED_BY_ID, t0.NOTE_ID, t0.PARENT_ACCOUNT_ID FROM T_ACCOUNT_SECURITY_FILTER t5, Y_OBJ_CATEGORY t4, T_PROJECT t3, E_ACCT t2, T_CONTACT t1, T_ACCOUNT t0 WHERE ((((((((((t0.VENDOR_APPL_TYPE_IID = 2) AND (t1.PRIMARY_KEY = 2004)) AND (t2."YEARACCT" = N'2012')) AND (t0.PROJECT_APPL_TYPE_IID = 2)) AND (t3.PRIMARY_KEY = 46537)) AND (t4.TREE_POSITION = N'ACCT_ACTL_CCSP_VNDR_MONT')) AND (t0.NAME = N'Actuals - Cost Center 10 - LA2012000250 - Singla, Ashima - 2012 - October')) AND (t2."PERIODACCT" = N'M9')) AND (t5.USER_ID = 1504)) AND (((((t1.PRIMARY_KEY = t0.APPL_VENDOR_ID) AND (t2.ACCOUNT_ID$ = t0.PRIMARY_KEY)) AND (t3.PRIMARY_KEY = t0.PROJECT_ID)) AND (t4.PRIMARY_KEY = t0.DEFAULT_CATEGORY_ID)) AND (t5.ENTERPRISE_OBJECT_ID = t0.PRIMARY_KEY)))
Query: ReadAllQuery(referenceClass=TFAccount sql="SELECT DISTINCT t0.PRIMARY_KEY, t0.TOTAL_ACCRUAL, t0.TOTAL_ALLOCATED, t0.ALLOC_LIMIT, t0.APPL_END_ON, t0.APPL_EXPENSE_PERCENT, t0.APPL_NON_US_TAX_PERCENT, t0.APPL_INVD_EXPENSE_PERCENT, t0.APPL_INVD_TASK_PERCENT, t0.APPL_START_ON, t0.APPL_TASK_PERCENT, t0.INVOLVED_APPL_TYPE_IID, t0.PROJECT_APPL_TYPE_IID, t0.VENDOR_APPL_TYPE_IID, t0.TOTAL_BG_AVAILABLE, t0.CREATED_ON, t0.STATUS_IID, t0.APPL_EXPENSE, t0.APPL_INVC_ACCRUAL, t0.APPL_INVC_CREDIT_NOTE, t0.APPL_NON_US_TAX, t0.APPL_INVC_SHADOW, t0.APPL_INVC_STANDARD, t0.APPL_INVD_EXPENSE, t0.APPL_INVD_TASK, t0.APPL_TASK, t0.AUTO_POST, t0.MODIFIED_ON, t0.NAME, t0.OVERDRAFT_TYPE_IID, t0.POSTED_TYPE_IID, t0.SECURITY_TYPE_IID, t0.TREE_KEY, t0.TYPE_IID, t0.TOTAL_USED, t0.VERSION, t0.APPL_EXPENSE_CATEGORY_ID, t0.APPL_NON_US_TAX_TYPE, t0.APPL_INVOLVED_ID, t0.APPL_INVD_EXP_CATEGORY_ID, t0.APPL_INVD_TASK_CATEGORY_ID, t0.APPL_PROJECT_CATEGORY_ID, t0.APPL_PROJ_DETAIL_FIELD_ID, t0.PROJECT_ID, t0.APPL_TASK_CATEGORY_ID, t0.APPL_VENDOR_ID, t0.APPROVAL_STATUS_ID, t0.CREATED_BY_ID, t0.CREATED_ON_BEHALF_OF_ID, t0.DEFAULT_CATEGORY_ID, t0.DOCUMENT_FOLDER_ID, t0.FORUM_ID, t0.MODIFIED_BY_ID, t0.NOTE_ID, t0.PARENT_ACCOUNT_ID FROM T_ACCOUNT_SECURITY_FILTER t5, Y_OBJ_CATEGORY t4, T_PROJECT t3, E_ACCT t2, T_CONTACT t1, T_ACCOUNT t0 WHERE ((((((((((t0.VENDOR_APPL_TYPE_IID = ?) AND (t1.PRIMARY_KEY = ?)) AND (t2."YEARACCT" = ?)) AND (t0.PROJECT_APPL_TYPE_IID = ?)) AND (t3.PRIMARY_KEY = ?)) AND (t4.TREE_POSITION = ?)) AND (t0.NAME = ?)) AND (t2."PERIODACCT" = ?)) AND (t5.USER_ID = ?)) AND (((((t1.PRIMARY_KEY = t0.APPL_VENDOR_ID) AND (t2.ACCOUNT_ID$ = t0.PRIMARY_KEY)) AND (t3.PRIMARY_KEY = t0.PROJECT_ID)) AND (t4.PRIMARY_KEY = t0.DEFAULT_CATEGORY_ID)) AND (t5.ENTERPRISE_OBJECT_ID = t0.PRIMARY_KEY)))")
    at org.eclipse.persistence.exceptions.DatabaseException.sqlException(DatabaseException.java:333)
    at org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.basicExecuteCall(DatabaseAccessor.java:687)
    at org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.executeCall(DatabaseAccessor.java:530)
    at org.eclipse.persistence.sessions.server.ServerSession.executeCall(ServerSession.java:529)

谢谢

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拉维·库马尔（Ravi Kumar）

您可以看看Apache的软件包。API可以提供一些您可能已经在做的功能，但是API可以更有效地完成这些功能。也就是说，没有告诉我们您实际在做什么，我们只能猜测。

您考虑过一些延迟加载技术吗

例如，在集合的实际迭代期间加载集合对象

或者具有存储在集合中的实际对象的轻量级表示（例如，仅对象的DB键）

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如果你想要高效的搜索，那么你应该考虑搜索引擎库，比如./p>你可以发布你的代码吗？这将有助于理解您的问题。代码使用的是专门为该应用程序构建的特定API，您很难理解。因为它不仅仅是简单的收集，列表。问题就解决了。这是由于DB处的空间不足造成的。谢谢大家，向拉维·库马里亚致意，你说得对。我在保密协议（NDA）下工作。我不能发布任何东西。我很抱歉。@Ravi.Kumar：那么你应该提供一个例子，概述你试图实现的想法。好的。我有一个屏幕，需要显示记录并搜索这些记录，我使用的是那里的API（这是我唯一的方法，因为我无法访问他们的数据库，也无法运行SQL查询）。屏幕上显示的每个记录都会搜索特定条件，我使用他们的搜索API进行搜索。我正在调试代码，发现该搜索方法引发了异常。我正在将错误日志粘贴到我的问题上。@Ravi.Kumar：如果你从他们的API中得到异常，那么你应该联系负责维护它的人。若你们想实现你们自己的搜索，那个么你们至少应该提供一个简单的结构，模仿你们正在使用的东西（尽管可能不一定需要复制），问题就解决了。这是由于DB处的空间不足造成的。谢谢大家，向拉维·库马尔致意，问题解决了。这是由于DB处的空间不足造成的。谢谢大家，向拉维·库马尔致意