{"id":186470,"date":"2023-03-10T10:15:43","date_gmt":"2023-03-10T15:15:43","guid":{"rendered":"https:\/\/ibkrcampus.com\/?p=186470"},"modified":"2023-03-10T10:15:39","modified_gmt":"2023-03-10T15:15:39","slug":"using-r-code-in-java-eclipse-with-rjava","status":"publish","type":"post","link":"https:\/\/www.interactivebrokers.com\/campus\/ibkr-quant-news\/using-r-code-in-java-eclipse-with-rjava\/","title":{"rendered":"Using R Code in Java Eclipse with rJava"},"content":{"rendered":"\n<p>This post shows how to use R code in&nbsp;<strong>Eclipse<\/strong>&nbsp;IDE for Java with&nbsp;<strong>rJava<\/strong>&nbsp;package. But this work requires several environment setting which is a little bit confusing. Although there are some good posts regarding this issue, we use a step by step guide with detailed screen captures for clear understanding.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-introduction\">Introduction<\/h3>\n\n\n\n<p>Occasionally we would encounter some problems which are not easy to implement in Java. Among them are financial or econometric model estimation or optimization, to name a few. But in many cases, these problems are easily solved in R thanks to its various packages which are supported by worldwide experts.<\/p>\n\n\n\n<p>This leads to the necessity of the connection between R and Java. For this purpose,&nbsp;<strong>rJava<\/strong>&nbsp;package provides this interface functionality but environment setting is not easy.<\/p>\n\n\n\n<p>With detailed screen captures, let&#8217;s find the efficient way to use rJava in Eclipse. For convenience, we assume R and Eclipse are installed already.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-installing-rjava\">Installing rJava<\/h3>\n\n\n\n<p>We need to install rJava package in R studio.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"493\" height=\"444\" data-src=\"\/campus\/wp-content\/uploads\/sites\/2\/2023\/03\/00_rJava_install-sh-fintech.png\" alt=\"\" class=\"wp-image-186472 lazyload\" data-srcset=\"https:\/\/ibkrcampus.com\/campus\/wp-content\/uploads\/sites\/2\/2023\/03\/00_rJava_install-sh-fintech.png 493w, https:\/\/ibkrcampus.com\/campus\/wp-content\/uploads\/sites\/2\/2023\/03\/00_rJava_install-sh-fintech-300x270.png 300w\" data-sizes=\"(max-width: 493px) 100vw, 493px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 493px; aspect-ratio: 493\/444;\" \/><\/figure>\n\n\n\n<p>We need to know the directory where rJava package is installed. In our case, this directory is as follow. (this is dependent on your Windows system)<\/p>\n\n\n\n<p>C:\\Users\\shlee\\Documents\\R\\win-library\\4.0<\/p>\n\n\n\n<p>The following figure displays files of&nbsp;<strong>rJava\/jri<\/strong>&nbsp;directory.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"561\" height=\"444\" data-src=\"\/campus\/wp-content\/uploads\/sites\/2\/2023\/03\/00_01_rJava_directory-sh-fintech.png\" alt=\"\" class=\"wp-image-186473 lazyload\" data-srcset=\"https:\/\/ibkrcampus.com\/campus\/wp-content\/uploads\/sites\/2\/2023\/03\/00_01_rJava_directory-sh-fintech.png 561w, https:\/\/ibkrcampus.com\/campus\/wp-content\/uploads\/sites\/2\/2023\/03\/00_01_rJava_directory-sh-fintech-300x237.png 300w\" data-sizes=\"(max-width: 561px) 100vw, 561px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 561px; aspect-ratio: 561\/444;\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Environment Variables<\/h3>\n\n\n\n<p>Find&nbsp;<strong>&#8220;Edit the system&nbsp;environment variables&#8221;<\/strong>&nbsp;and open&nbsp;<strong>System Properties<\/strong>&nbsp;box, and click&nbsp;<strong>Environment Variables &#8230;&nbsp;<\/strong>button.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"749\" height=\"772\" data-src=\"\/campus\/wp-content\/uploads\/sites\/2\/2023\/03\/00_02_Environment_variables_box-sh-fintech.png\" alt=\"\" class=\"wp-image-186475 lazyload\" data-srcset=\"https:\/\/ibkrcampus.com\/campus\/wp-content\/uploads\/sites\/2\/2023\/03\/00_02_Environment_variables_box-sh-fintech.png 749w, https:\/\/ibkrcampus.com\/campus\/wp-content\/uploads\/sites\/2\/2023\/03\/00_02_Environment_variables_box-sh-fintech-700x721.png 700w, https:\/\/ibkrcampus.com\/campus\/wp-content\/uploads\/sites\/2\/2023\/03\/00_02_Environment_variables_box-sh-fintech-300x309.png 300w\" data-sizes=\"(max-width: 749px) 100vw, 749px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 749px; aspect-ratio: 749\/772;\" \/><\/figure>\n\n\n\n<p>Add&nbsp;<strong>Path<\/strong>&nbsp;as a new variable in&nbsp;<strong>System Variables<\/strong>&nbsp;as follows.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Path : C:\\Users\\shlee\\Documents\\R\\win-library\\4.0\\rJava\\jri\\x64;<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"706\" height=\"777\" data-src=\"\/campus\/wp-content\/uploads\/sites\/2\/2023\/03\/00_03_Environment_variables_button-sh-fintech.png\" alt=\"\" class=\"wp-image-186476 lazyload\" data-srcset=\"https:\/\/ibkrcampus.com\/campus\/wp-content\/uploads\/sites\/2\/2023\/03\/00_03_Environment_variables_button-sh-fintech.png 706w, https:\/\/ibkrcampus.com\/campus\/wp-content\/uploads\/sites\/2\/2023\/03\/00_03_Environment_variables_button-sh-fintech-700x770.png 700w, https:\/\/ibkrcampus.com\/campus\/wp-content\/uploads\/sites\/2\/2023\/03\/00_03_Environment_variables_button-sh-fintech-300x330.png 300w\" data-sizes=\"(max-width: 706px) 100vw, 706px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 706px; aspect-ratio: 706\/777;\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Eclipse Project and Class<\/h3>\n\n\n\n<p>Make a new project in Eclipse :&nbsp;<strong>File<\/strong>&nbsp;-&gt;&nbsp;<strong>New&nbsp;<\/strong>-&gt;&nbsp;<strong>Java Project&nbsp;<\/strong>.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"717\" height=\"604\" data-src=\"\/campus\/wp-content\/uploads\/sites\/2\/2023\/03\/01_File_New_JavaProject-sh-fintech.png\" alt=\"\" class=\"wp-image-186478 lazyload\" data-srcset=\"https:\/\/ibkrcampus.com\/campus\/wp-content\/uploads\/sites\/2\/2023\/03\/01_File_New_JavaProject-sh-fintech.png 717w, https:\/\/ibkrcampus.com\/campus\/wp-content\/uploads\/sites\/2\/2023\/03\/01_File_New_JavaProject-sh-fintech-700x590.png 700w, https:\/\/ibkrcampus.com\/campus\/wp-content\/uploads\/sites\/2\/2023\/03\/01_File_New_JavaProject-sh-fintech-300x253.png 300w\" data-sizes=\"(max-width: 717px) 100vw, 717px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 717px; aspect-ratio: 717\/604;\" \/><\/figure>\n\n\n\n<p>Insert&nbsp;<strong>aRjava<\/strong>&nbsp;or your favorite name as&nbsp;<strong>Project name<\/strong>.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Project name : aRjava<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"948\" height=\"884\" data-src=\"\/campus\/wp-content\/uploads\/sites\/2\/2023\/03\/02_Create_a_Java_Project_aRjava-sh-fintech.png\" alt=\"\" class=\"wp-image-186479 lazyload\" data-srcset=\"https:\/\/ibkrcampus.com\/campus\/wp-content\/uploads\/sites\/2\/2023\/03\/02_Create_a_Java_Project_aRjava-sh-fintech.png 948w, https:\/\/ibkrcampus.com\/campus\/wp-content\/uploads\/sites\/2\/2023\/03\/02_Create_a_Java_Project_aRjava-sh-fintech-700x653.png 700w, https:\/\/ibkrcampus.com\/campus\/wp-content\/uploads\/sites\/2\/2023\/03\/02_Create_a_Java_Project_aRjava-sh-fintech-300x280.png 300w, https:\/\/ibkrcampus.com\/campus\/wp-content\/uploads\/sites\/2\/2023\/03\/02_Create_a_Java_Project_aRjava-sh-fintech-768x716.png 768w\" data-sizes=\"(max-width: 948px) 100vw, 948px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 948px; aspect-ratio: 948\/884;\" \/><\/figure>\n\n\n\n<p>Make a new class :&nbsp;<strong>File<\/strong>&nbsp;-&gt;&nbsp;<strong>New&nbsp;<\/strong>-&gt;&nbsp;<strong>Class&nbsp;<\/strong>.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"716\" height=\"786\" data-src=\"\/campus\/wp-content\/uploads\/sites\/2\/2023\/03\/03_src_New_Class-shfintech.png\" alt=\"\" class=\"wp-image-186481 lazyload\" data-srcset=\"https:\/\/ibkrcampus.com\/campus\/wp-content\/uploads\/sites\/2\/2023\/03\/03_src_New_Class-shfintech.png 716w, https:\/\/ibkrcampus.com\/campus\/wp-content\/uploads\/sites\/2\/2023\/03\/03_src_New_Class-shfintech-700x768.png 700w, https:\/\/ibkrcampus.com\/campus\/wp-content\/uploads\/sites\/2\/2023\/03\/03_src_New_Class-shfintech-300x329.png 300w\" data-sizes=\"(max-width: 716px) 100vw, 716px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 716px; aspect-ratio: 716\/786;\" \/><\/figure>\n\n\n\n<p>Insert&nbsp;<strong>CRjava<\/strong>&nbsp;or your favorite name as&nbsp;<strong>Name<\/strong>.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Name : CRjava<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"681\" height=\"746\" data-src=\"\/campus\/wp-content\/uploads\/sites\/2\/2023\/03\/04_New_Java_Class_CRjava-shfintech.png\" alt=\"\" class=\"wp-image-186484 lazyload\" data-srcset=\"https:\/\/ibkrcampus.com\/campus\/wp-content\/uploads\/sites\/2\/2023\/03\/04_New_Java_Class_CRjava-shfintech.png 681w, https:\/\/ibkrcampus.com\/campus\/wp-content\/uploads\/sites\/2\/2023\/03\/04_New_Java_Class_CRjava-shfintech-300x329.png 300w\" data-sizes=\"(max-width: 681px) 100vw, 681px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 681px; aspect-ratio: 681\/746;\" \/><\/figure>\n\n\n\n<p><em>Visit <a href=\"https:\/\/kiandlee.blogspot.com\/2021\/06\/using-r-code-in-java-eclipse-with-rjava.html\">SH Fintech Modeling<\/a> Blog for instructions on how to write a Java code with rJava and to read the full article. <\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>This post shows how to use R code in Eclipse IDE for Java with rJava package.<\/p>\n","protected":false},"author":662,"featured_media":20799,"comment_status":"closed","ping_status":"open","sticky":true,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[339,347,343,338,342],"tags":[806,7376,596,487,12855,508],"contributors-categories":[13728],"class_list":{"0":"post-186470","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-data-science","8":"category-java-development","9":"category-programing-languages","10":"category-ibkr-quant-news","11":"category-r-development","12":"tag-data-science","13":"tag-eclipse","14":"tag-java","15":"tag-r","16":"tag-rjava","17":"tag-rstudio","18":"contributors-categories-sh-fintech-modeling"},"pp_statuses_selecting_workflow":false,"pp_workflow_action":"current","pp_status_selection":"publish","acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.9 (Yoast SEO v27.5) - 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