用於處理列表的Java API

我正在做很多處理和搜索對象列表。渲染結果時，我的應用程序出現內存不足。有沒有任何API處理/處理對象列表有效，我試圖優化它。用於處理列表的Java API

還有一件事我想告訴，我正在用新的ArrayList初始化我的所有列表。我應該使用別的東西嗎？

我有一個屏幕需要顯示記錄和搜索這些記錄，我使用那裏的API（唯一的方法，因爲我沒有訪問他們的數據庫，我無法運行SQL查詢。在屏幕上顯示搜索的具體標準，我正在使用他們的搜索API相同。我正在調試代碼並發現該搜索方法拋出異常。我粘貼錯誤日誌

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)

感謝拉維·庫馬爾

來源

2012-05-02 Ravi.Kumar

你可以發佈你的代碼。這將有助於理解你的問題。 –

該代碼使用特定的API專門爲該應用程序構建，這對你們來說很難理解。因爲它不僅僅是簡單的收集，列表。 –

問題解決了。這是因爲DB的空間不足。謝謝大家最好的問候Ravi Kumar –

你可以看看Apache的CollectionUils包。該API可以提供一些您可能已經在做的功能，但API可能會更有效。這就是說，沒有告訴我們你在做什麼，我們只能推測。

來源

2012-05-02 06:31:57 npinti

是的，你是對的。我在非保密協議（NDA）下工作。我無法發佈任何內容。我很抱歉。 –

@ Ravi.Kumar：那麼你應該提供一個例子來概述你試圖完成的想法。 – home

好的。我有一個需要顯示記錄和搜索這些記錄的屏幕，我使用那裏的API（唯一的方式，因爲我沒有訪問他們的數據庫，我無法運行SQL查詢。）屏幕上顯示的每條記錄搜索特定條件，我正在使用他們的搜索API相同。我正在調試代碼並發現該搜索方法拋出異常。我在我的問題上粘貼錯誤日誌。 –

你考慮過一些懶惰的加載技術嗎？例如

例如在實際迭代過程中加載集合對象。

或者存儲在集合中的實際對象有一個輕量級表示（例如只有對象的DB鍵）。

如果你想高效搜索，那麼你應該考慮搜索引擎庫，如Lucene。

來源

2012-05-02 06:35:32 Svilen

問題解決了。這是因爲DB的空間不足。謝謝大家最好的問候拉維庫馬爾 –

用於處理列表的Java API

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