当运行Shiny时，我会在调用下载函数时收到“java.lang.OutOfMemoryError：Java堆空间”的消息。它适用于数据文件较小的情况;但是我正在查看的实例中所有表的组合应该少于5,000行和15列。有人可以帮助我使用这种文件大小使我的downloadHandler功能正常吗？
*# server.R*
library(XLConnect)
shinyServer(function(input, output, session) {
... (filtering operation on a data frame to create multiple sub tables)
output$downloadData <- downloadHandler(
filename = function() {paste(input$category,"_raw_token_data.xlsx")},
content = function(file){
fname <- paste(file,"xlsx",sep=".")
wb <- loadWorkbook(fname, create = TRUE)
createSheet(wb, name = "-terms")
createSheet(wb, name = "+terms")
createSheet(wb, name = "-tokens")
createSheet(wb, name = "+tokens")
createSheet(wb, name = "test_stats")
writeWorksheet(wb, raw()$filter_neg, sheet = "-terms")
writeWorksheet(wb, raw()$filter_kw, sheet = "+terms")
writeWorksheet(wb, df()$neg_raw, sheet = "-tokens")
writeWorksheet(wb, df()$rel_raw, sheet = "+tokens")
writeWorksheet(wb, df()$test_raw, sheet = "test_stats")
saveWorkbook(wb)
file.rename(fname,file)
}
) # closing for downloadHandler
}) # closing for shinyServer
解决方案：
options(java.parameters = "-Xmx1g") # increase heap size to 1gb
library(RWeka)